Malicious PDF — malware analysis report

Static analysis result for SHA-256 37e817172d1c5c8c…

MALICIOUS

PDF

83.3 KB Created: 2021-02-12 17:37:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: dd9d6a45b6d1c07be060099c930b6f2d SHA-1: f5cb5241c3b22e98c2330cb8d688989417d140b7 SHA-256: 37e817172d1c5c8c6d8ba70460b90b40b32fc08ec176d6e23b9700abf94321fc
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO manipulation. The presence of numerous unknown URLs suggests a distribution mechanism for potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://bologen.ru/wix?keyword=nikon+coolpix+l320+manual+mode PDF link annotation
    • https://zanikegira.weebly.com/uploads/1/3/1/4/131437850/6457674.pdfIn PDF document text
    • https://difototasewi.weebly.com/uploads/1/3/5/9/135986065/400329.pdfIn PDF document text
    • http://7lessons.website/958889300777vocp.pdfIn PDF document text
    • https://mozeduxazos.weebly.com/uploads/1/3/4/0/134018133/c613f.pdfIn PDF document text
    • https://gibiboxovozigux.weebly.com/uploads/1/3/4/7/134722082/1281118.pdfIn PDF document text
    • http://sadovik.me/super_jupper_jungle_world_apk_download0lslb.pdfIn PDF document text
    • http://vamoktin.ru/vebux3t9s0.pdfIn PDF document text
    • http://sentytld.online/304691977141j9kx.pdfIn PDF document text
    • https://rewemekekebaz.weebly.com/uploads/1/3/1/4/131406535/rerowazan-pabok-luxutulemonu-zafaxiwedi.pdfIn PDF document text
    • http://vizimuvorogo.22web.org/56424247888.pdfIn PDF document text
    • https://jozufibajas.weebly.com/uploads/1/3/0/9/130969385/wezobifegaropix.pdfIn PDF document text
    • http://hamsterbig.com/48313382170t5kgy.pdfIn PDF document text
    • http://jobs-ingenieur.best/80500039168atcn0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gedexim/administrao_de_produo_livro.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/dewurepiwuseromowuru.pdfIn PDF document text
    • http://kidogip.epizy.com/bmw_225xe_iperformance_active_tourer_r.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/bahubali_1_video_songs_tollyload.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE396 3312 bytes
SHA-256: cb5c8c6405a97e289a1d37fd8f3fa0fb9a9e5cd02c3f475be668e5c7f8c23a8c
font_01_sfnt_off0000ef77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF77 5484 bytes
SHA-256: d477ff929658fffc7241d66fbd0ec944cc611aeb0ceb2ee4065b6c1676961011
font_02_sfnt_off0001021b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021B 12296 bytes
SHA-256: a334112d2a21f881789b1b3296d56279543234d2630753a4f1ac0f689954f512
font_03_sfnt_off00012a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A55 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073

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