Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b8aaa5c15268218…

MALICIOUS

PDF

78.4 KB Created: 2021-05-30 17:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 51a7be36f6ad5884f7de1e122b77cb76 SHA-1: 43eb64db520a6a8d5b6b817138798e9da8951375 SHA-256: 0b8aaa5c152682186a4ec21386069f53a7b89f00a717e4e97dc5593a04a20786
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, containing numerous external URLs pointing to other PDF files hosted on disposable domains. The primary URL, 'https://maypoin.ru/123?utm_term=beehive+class+9+pdf+chapter+3', suggests a potential lure related to educational content, which is then used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://maypoin.ru/123?utm_term=beehive+class+9+pdf+chapter+3 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457281/normal_605b187752980.pdfIn PDF document text
    • https://gepavemu.weebly.com/uploads/1/3/4/8/134861499/rirodazoguk-vosuwel-zusesapuxagap.pdfIn PDF document text
    • https://sefidobove.weebly.com/uploads/1/3/4/3/134320077/e5095acb4e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457861/normal_5fd088b67d948.pdfIn PDF document text
    • https://setoximusekaz.weebly.com/uploads/1/3/4/7/134714347/mexuguv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490720/normal_6054bf46a8865.pdfIn PDF document text
    • https://lefafikof.weebly.com/uploads/1/3/0/9/130969708/16007.pdfIn PDF document text
    • https://gizajowi.weebly.com/uploads/1/3/4/3/134314542/6947e755.pdfIn PDF document text
    • https://salapabozob.weebly.com/uploads/1/3/5/3/135326799/2adb98f45a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454277/normal_5ffcb33d4c09b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445754/normal_5fe3688ca025c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379489/normal_6067404e99f23.pdfIn PDF document text
    • https://wabozejitikaz.weebly.com/uploads/1/3/4/4/134495441/5598ff3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456686/normal_60069adcd8a66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394079/normal_605ee6499612d.pdfIn PDF document text
    • https://valiwuvubeke.weebly.com/uploads/1/3/4/6/134694219/a389cf3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389797/normal_6028ebe935303.pdfIn PDF document text
    • https://linonorimezolup.weebly.com/uploads/1/3/7/5/137519838/nexipijinizi_zupirepivukido_tafarag_fenomigubaxozu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380694/normal_600d084dbf522.pdfIn PDF document text
    • https://xolesozetenosox.weebly.com/uploads/1/3/1/0/131070434/fuwakutezolofe.pdfIn PDF document text
    • https://lefitujeledezov.weebly.com/uploads/1/3/6/0/136028835/9046959.pdfIn PDF document text
    • https://vazoxavaver.weebly.com/uploads/1/3/4/8/134863882/sivebulupudoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419225/normal_606aecc51fde6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370989/normal_604aefb9b8650.pdfIn PDF document text
    • https://vokufasel.weebly.com/uploads/1/3/4/8/134872836/bunusuwo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D9 5672 bytes
SHA-256: 802e3d8e742a70ba47013a57ad9bca7fbed275af34bf1ad9bb2045633eb30680
font_01_sfnt_off00010623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10623 10528 bytes
SHA-256: 18a62d54dd15fd4c1176c9b5ee58bcc92ce931b710fa306493582035bceb9751