Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f26f6039222b06…

MALICIOUS

PDF

111.3 KB Created: 2021-06-07 18:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 156f9ff58325cccac5edd461053a905a SHA-1: 758d52d05e4a975085fdd2f7fe1145dba5bf4131 SHA-256: c0f26f6039222b062a4655482c730fd81e488af391fe98d4eba7618cdf9c877e
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URLs pointing to other PDF documents, likely to obscure the final malicious destination. The presence of external URIs and the link farm behavior suggest a phishing or malware distribution scheme, potentially using embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/pbw?utm_term=b1+level+english+reading+books+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481988/normal_5fcbdd87e48ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407552/normal_6014a37052fa4.pdfIn PDF document text
    • https://xonatiwomunonow.weebly.com/uploads/1/3/1/8/131856992/5841806.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368238/normal_5fe2b92d5c79c.pdfIn PDF document text
    • https://piwuwati.weebly.com/uploads/1/3/4/4/134404243/c9b973a7186.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382948/normal_6010c6de49e63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371790/normal_600a0a7200135.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495264/normal_604cee25df5ee.pdfIn PDF document text
    • https://tadiselugel.weebly.com/uploads/1/3/4/5/134589133/rezevurulagipesepu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492593/normal_602c862015342.pdfIn PDF document text
    • https://toxejezewigi.weebly.com/uploads/1/3/4/5/134513259/fc2e30d63af7d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445128/normal_605faa44610c8.pdfIn PDF document text
    • https://xikalevu.weebly.com/uploads/1/3/4/3/134319979/7a73a4ab3f87588.pdfIn PDF document text
    • https://liwojugimigazip.weebly.com/uploads/1/3/4/9/134904469/f9414.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://binovilijire.pbworks.com/w/file/fetch/144707163/51033748500.pdfIn PDF document text
    • http://mudowomuxexo.pbworks.com/f/what_to_say_in_pip_mandatory_reconsideration_letter.pdfIn PDF document text
    • http://noxixap.pbworks.com/w/file/fetch/144426420/833167766.pdfIn PDF document text
    • http://dutamaboxiwa.pbworks.com/f/gesalagovokuzuravapifufex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5539ef3-1fd8-4848-a4b3-61190cdfaee2/20098932473.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/122786ad-eec0-4bb8-a520-36c309ae7f92/are_bob_evans_mashed_potatoes_real.pdfIn PDF document text
    • http://zakikumese.pbworks.com/w/file/fetch/144795264/terraria_happy_days_afk_farm.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000174fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174FD 5668 bytes
SHA-256: a5c035a747584db0d11d57ad2b86c6153832e451b12ba4cee55fe3125419e7d6
font_01_sfnt_off00018851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18851 11732 bytes
SHA-256: 8d3032bb72bc5b9169f189cdb48567abab937e4171c7058d850d084a9f3a650f