Malicious PDF — malware analysis report

Static analysis result for SHA-256 14418e52912bb400…

MALICIOUS

PDF

106.3 KB Created: 2021-05-22 16:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1f9eecafe826403e4f8eff15d418d776 SHA-1: e87da3a36b75c296aeea3d2db0e9197a176f1529 SHA-256: 14418e52912bb400768c4b785cc9a73b3be92fcb1a2ddee0f3d8506b71fcbbc4
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create SEO-optimized PDFs for link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/strik?utm_term=what+is+the+role+of+sales+and+marketing+executive PDF link annotation
    • https://lumejukotexute.weebly.com/uploads/1/3/1/1/131163930/3929658.pdfIn PDF document text
    • https://gutoserenenew.weebly.com/uploads/1/3/2/6/132681448/6667692.pdfIn PDF document text
    • https://zavoroxovedigij.weebly.com/uploads/1/3/1/3/131398250/1135.pdfIn PDF document text
    • https://xexafuru.weebly.com/uploads/1/3/1/0/131070851/3739558.pdfIn PDF document text
    • https://vabebixeteguju.weebly.com/uploads/1/3/4/2/134234611/xogurazuravobezalado.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408584/normal_5ff514e10e711.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486565/normal_5fc7fc05d0fa3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487626/normal_5ff5a36f11da8.pdfIn PDF document text
    • https://nobakavukip.weebly.com/uploads/1/3/4/3/134373074/raperadovudugusumug.pdfIn PDF document text
    • https://jenodaxadow.weebly.com/uploads/1/3/4/0/134012655/0c5c87f7680d.pdfIn PDF document text
    • https://pimupaxepa.weebly.com/uploads/1/3/1/8/131857198/puken_nogimitedumizod_waxez_bujufi.pdfIn PDF document text
    • https://nizomepovunamox.weebly.com/uploads/1/3/4/3/134305669/9220570.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/fidupexazu.pdfIn PDF document text
    • https://nedetuvozuwe.weebly.com/uploads/1/3/4/6/134699612/8091356.pdfIn PDF document text
    • https://fowowudajij.weebly.com/uploads/1/3/5/3/135312379/af8c484c39f1539.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/remeranexe/vitamix_5200_us_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d60947e-08bf-4385-9a6f-4c59f774e028/apply_for_a_capitec_account_online.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/belit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a6f573b-58ec-49bb-84e1-d552041ed5ca/how_long_does_it_take_to_get_a_bartending_license_in_wisconsin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/211a11fe-cfa0-413e-9aca-4470a6f67787/what_is_the_primary_purpose_of_a_deed.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CFF 5640 bytes
SHA-256: 13942215edf809b6780d70793e061a16a63136ef5d144901ebf66dd54db0d89b
font_01_sfnt_off00016017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16017 11440 bytes
SHA-256: 18e680816539d45c12b932ebc3f397b84a4b1a57ff8de48c19297e2bb341f87e
font_02_sfnt_off000186e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186E0 16060 bytes
SHA-256: 313c3940a6f4aae92ceaa1b1a843de6e6f13411355a457aba6e018c383fce54c