Malicious PDF — malware analysis report

Static analysis result for SHA-256 b37cecb7c1042a94…

MALICIOUS

PDF

72.8 KB Created: 2021-03-22 20:37:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7aaeb7cddc73b46b9b4eac192d475677 SHA-1: 27e51d4162e45be9a6da0562b4d96d35c1fc4b65 SHA-256: b37cecb7c1042a94e9b1e222579f441ced231a93544d15f7a9b7ccefcd8cd2bd
186 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as a link farm designed to redirect users to external websites, with one URL being https://mezovuduw.ru/award?keyword=alpha+beta+pruning+example+pdf. The ML classifier and ClamAV also strongly indicated maliciousness, suggesting a phishing or malware distribution intent. No scripts were extracted from this sample.

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
  • 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://mezovuduw.ru/award?keyword=alpha+beta+pruning+example+pdf PDF link annotation
    • https://cdn.sqhk.co/xorilulog/iVgjbhe/my_floorball_skiller_zone_360.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371800/normal_601073ffcee3b.pdfIn PDF document text
    • https://tamipabofoj.weebly.com/uploads/1/3/4/8/134876193/cb8802.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456671/normal_5ff258fad19bf.pdfIn PDF document text
    • https://cdn.sqhk.co/wajewukudino/jdwIRiV/96246109603.pdfIn PDF document text
    • https://cdn.sqhk.co/ponesigis/3RXxe62/among_us_guide_tips.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393483/normal_5ff866ec0a141.pdfIn PDF document text
    • https://cdn.sqhk.co/norejasiwiza/jgpajac/my_verizon_disconnected_account_login.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369796/normal_5fe4681365d67.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387412/normal_5ff462a4e5df3.pdfIn PDF document text
    • https://cdn.sqhk.co/xajamenujo/ss57gdj/73842934170.pdfIn PDF document text
    • https://xigakoter.weebly.com/uploads/1/3/1/3/131379919/kejutone-rabopezaxufin-gelaroja-fakagudativi.pdfIn PDF document text
    • https://tadadali.weebly.com/uploads/1/3/4/0/134095934/9743450.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/regufojalojaza/buddypress_registration_form_css.pdfIn PDF document text
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_e169e76ae26243d3905d4a54dab25bf0.pdf?index=trueIn PDF document text
    • https://d8ec88ce-93b1-4b83-b294-7016fd5b5063.filesusr.com/ugd/366252_c9999b09fc4c469789b9f3a06f3cf57c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/sonipobonekamevemibixefop.pdfIn PDF document text
    • https://1094d5c0-a920-47c7-a1de-7e2d56a92d84.filesusr.com/ugd/47b1e8_148a20ac07c244c1bee68e75e8aae65e.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18C 5472 bytes
SHA-256: e1728a9af0055750dcd8437cc5212d62d9d288b904c96c3f54b4dc843c68ec3f
font_01_sfnt_off0000f3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FD 9988 bytes
SHA-256: f8bbc58a0c8224ae12535289b06f273e8473efb442e7fcc210eee91a47de3c95

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