Malicious PDF — malware analysis report

Static analysis result for SHA-256 804245e88b7c691b…

MALICIOUS

PDF

89.6 KB Created: 2021-05-27 06:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 92a1b16a9ed83229e96382dc2f65b796 SHA-1: 698bcaf4310b91d28c86d17e3b26d1093ee5acec SHA-256: 804245e88b7c691ba0ef15a098547756e8a81a3edd893fc14cf020c8a42eeff5
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript T1553.005 Security Software Installation

This PDF document exhibits multiple indicators of malicious intent, including a high ML classification score and ClamAV detection as a phishing trojan. The document body, though partially corrupted, suggests a fake error message related to 'Gameloop turbo aow engine error' to deceive the user. Crucially, a heuristic firing indicates an instruction to disable security software, a common tactic to bypass defenses before downloading further payloads. The presence of numerous external links, many hosted on disposable domains, further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://vilenefex.ru/strik?utm_term=gameloop+turbo+aow+engine+error PDF link annotation
    • https://wudigunufite.weebly.com/uploads/1/3/4/6/134611509/fd2a1b0b0b120.pdfIn PDF document text
    • https://musazulawikale.weebly.com/uploads/1/3/5/3/135305526/zojexevimesuk.pdfIn PDF document text
    • https://kawepuwaseleza.weebly.com/uploads/1/3/4/8/134849925/gidejip_negam.pdfIn PDF document text
    • https://fawukudaboguris.weebly.com/uploads/1/3/4/3/134353338/fatemawezesuguwepef.pdfIn PDF document text
    • https://girusidopot.weebly.com/uploads/1/3/0/7/130738876/6593763.pdfIn PDF document text
    • https://saguwaxofules.weebly.com/uploads/1/3/2/6/132681351/pezuw.pdfIn PDF document text
    • https://pevolevu.weebly.com/uploads/1/3/1/6/131606362/todetakixupuvekisuno.pdfIn PDF document text
    • https://rowimunikak.weebly.com/uploads/1/3/5/3/135346477/38365f3.pdfIn PDF document text
    • https://lugilabujenubo.weebly.com/uploads/1/3/4/3/134320616/4714175.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377935/normal_603a4d8982eda.pdfIn PDF document text
    • https://kapokifi.weebly.com/uploads/1/3/4/5/134510442/dofavabapig_wevobudabete_vaxaj.pdfIn PDF document text
    • https://wudegilunukoga.weebly.com/uploads/1/3/1/3/131379548/d2725ab8554.pdfIn PDF document text
    • https://zikamesezelili.weebly.com/uploads/1/3/4/8/134857079/tuxonidapo.pdfIn PDF document text
    • https://kopiwuzurori.weebly.com/uploads/1/3/1/3/131398237/7673205.pdfIn PDF document text
    • https://komamizidunip.weebly.com/uploads/1/3/1/4/131437982/sopamugenojozezeve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480389/normal_6054f56270071.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459164/normal_604d63c241276.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/edd6e189-e634-4e7b-93f5-6cc6c47cfc25/66030678377.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d69a448e-00d5-4950-ace0-d187037d33a3/25964984223.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f606e289-cbda-4ff5-b33c-e2f9076a4f70/what_is_the_central_theme_of_act_1_in_macbeth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f119979f-eed0-4291-a1d9-5f90b5317756/chemistry_single_replacement_reaction_worksheet_practice_reactions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/320a3724-f103-4a80-abcd-d8d2d535f2cb/33246867671.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001306d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1306D 22892 bytes
SHA-256: 911c9a6453cae76940df194eb425b200014a0ecbc0249e1eb3799bc5e67a3e85
font_00_sfnt_off0000eda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA9 5224 bytes
SHA-256: e54a1ad3cdfc0234c30c2a420975dd06309a0a6c1c0321e274bd36f330dd11c5
font_01_sfnt_off0000ff66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF66 1924 bytes
SHA-256: bf4319a2c96f202d5fa3a0dd7368fa4ae5cdee287b290999b6af251d295603ff
font_02_sfnt_off000108b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B9 11904 bytes
SHA-256: 03eb61ba4a127baf9d5d49695d5649ca0034000642a7d0ec0fa15b5ee046c387

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