Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd564302f1e09269…

MALICIOUS

PDF

82.1 KB Created: 2020-12-22 23:33:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 86a024e3e06b4245a7f9605c8706171b SHA-1: 10d819713c270e8ef0e7d1b3addd4c83514d96e9 SHA-256: fd564302f1e092694734ca286cb721b0d3e567d7b48764bd01e125d90f75eb64
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://ggtraff.ru/strik?utm_term=venus+flytrap+wkrp+quotes In PDF document text
    • https://bagexefegaluja.weebly.com/uploads/1/3/4/3/134393574/2286260.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377379/normal_5fb4ae5d4fafa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382613/normal_5fa913820e61d.pdfIn PDF document text
    • https://kudumegowejo.weebly.com/uploads/1/3/4/2/134266354/feboxeminenasev.pdfIn PDF document text
    • https://revafabeku.weebly.com/uploads/1/3/4/7/134708131/wapegubiworew_gobaremolira_gajaboze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453901/normal_5fbfa211dbf22.pdfIn PDF document text
    • https://gidepojijozi.weebly.com/uploads/1/3/4/2/134235950/firewa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469827/normal_5fc2829414b3c.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/182c6996-67bc-40fc-a13d-d37ad0f73ff2/lixonixajopakamadek.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/besegeli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbbe64a7-1fd9-4e5e-a527-38fd122288aa/gallbladder_meridian_point.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/idmgcext._crx_chrome_extension_free.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce513ecc0d2519aaa13aa6/t/5fd71e245b1f6f7539ef1b05/1607933477449/muxeviwekokuniwufigami.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44cd4b1b-92df-4fd1-91b2-d7aec4a838b8/bizidevoz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000113ff.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x113FF 22820 bytes
SHA-256: 45e67917de0fe52bbf898a47eb3e752aea99b6365b058f73f32482836f53935f
font_00_sfnt_off0000ddca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCA 5244 bytes
SHA-256: 55517f6dbd520e6f46c2f9250c64ff4cf4049b0a8eb6e65bcbedf476b7b63e1f
font_01_sfnt_off0000efd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD3 10532 bytes
SHA-256: ab381c629ef03915f05fc2986f003d61769393a62435c99c1c6e35328169598d

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