Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6086d32b51ecbb0…

MALICIOUS

PDF

90.5 KB Created: 2021-04-15 20:33:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 992d8f0068c92a8ee5feb9e216cc47ed SHA-1: b63b6809be3b1351edd35b5139d1f63ee3529ff9 SHA-256: d6086d32b51ecbb01baa5ac59021f590614d31d369244103b1d527e056cd0939
186 Risk Score

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://botokaw.ru/strik?utm_term=winning+ugly+lyrics PDF link annotation
    • https://gamalisixidu.weebly.com/uploads/1/3/5/9/135958628/zalag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378393/normal_6067f7dca334d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470523/normal_603cbe8122d26.pdfIn PDF document text
    • http://tuzupibu.scienceontheweb.net/what_does_to_review_something_mean.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425227/normal_60643ea98e181.pdfIn PDF document text
    • http://zarewubizeno.mywebcommunity.org/83009426191.pdfIn PDF document text
    • https://koxufujemugipad.weebly.com/uploads/1/3/0/7/130739729/fugof.pdfIn PDF document text
    • http://jonotijero.medianewsonline.com/what_are_the_signs_a_man_is_not_interested_in_you.pdfIn PDF document text
    • https://nidedijuba.weebly.com/uploads/1/3/0/8/130814831/vowiravomesito-wunoloz.pdfIn PDF document text
    • https://jamiwimavebu.weebly.com/uploads/1/3/1/4/131453695/4081337.pdfIn PDF document text
    • http://nizavevorupuj.mywebcommunity.org/komokixota.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420597/normal_603d43090d811.pdfIn PDF document text
    • https://jukirabupunux.weebly.com/uploads/1/3/0/8/130874410/1060539.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://livirava.atwebpages.com/sa_file_b_li_font.pdfIn PDF document text
    • http://moxosutemow.onlinewebshop.net/zexemujaxemepozome.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a026a345-f18b-4b59-8d25-b9c972a72723/how_to_start_html_in_visual_studio_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f748f00-4496-4711-940d-839e0d207077/how_to_loom_a_square.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ed308d6-ec06-4d6b-a0c1-35bdb3b10bb0/jaxuko.pdfIn PDF document text
    • http://movuzawizigevej.myartsonline.com/accounting_learn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71c76d15-1fc1-4b46-b332-c3cb41603077/church_annual_report_example.pdfIn PDF document text
    • http://sufixis.myartsonline.com/pygmalion_george_bernard_shaw_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afe609ee-4265-4ff6-bb5e-efdc9fb01220/48392394044.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11749 4448 bytes
SHA-256: 8a731070fa8dd6af0cb4ca379796ed836330bb15d7947e139528e7f8fc676504
font_01_sfnt_off00012669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12669 12556 bytes
SHA-256: ccdcdd25a3a9e7f81609cd652ad60a8e646192d3b7c6c5d89e8583ae7cc19b13
font_02_sfnt_off00014e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E8C 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f