Malicious PDF — malware analysis report

Static analysis result for SHA-256 339d10b98ce6e7cb…

MALICIOUS

PDF

73.6 KB Created: 2021-02-27 05:25:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 519d723f9820abebc29ffff42472e387 SHA-1: c1b51bd0b0f4e2b2cc7ce0c3cae42021593dc198 SHA-256: 339d10b98ce6e7cb9b60ebb8c08c2ba279b9bd63f27cd8e279b916494f796b7f
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful websites.

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://ponafet.ru/award?keyword=lawn+boy+push+mower+for+sale PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401555/normal_6009ceef78e57.pdfIn PDF document text
    • https://dagarodidosuva.weebly.com/uploads/1/3/2/6/132696056/mukaji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485570/normal_5fe88d94a564f.pdfIn PDF document text
    • https://dasufurejer.weebly.com/uploads/1/3/0/9/130969026/7337470.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387230/normal_601f020e283c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452217/normal_5fe9caf1ad37d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408713/normal_603282af55418.pdfIn PDF document text
    • https://gajegebukorivip.weebly.com/uploads/1/3/4/4/134487765/kukenugejumusit-birumej-sinodiwoge.pdfIn PDF document text
    • https://tirepululavapiw.weebly.com/uploads/1/3/4/5/134576363/rusokozapuwateg_takole_luxavifut.pdfIn PDF document text
    • https://forerijekakifur.weebly.com/uploads/1/3/5/4/135401119/2552706.pdfIn PDF document text
    • https://nuxofenaf.weebly.com/uploads/1/3/5/3/135306259/zaboturujen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473044/normal_5fe65499d66d7.pdfIn PDF document text
    • https://kapavumir.weebly.com/uploads/1/3/5/3/135313873/nopiboxamuv-karerosotuji-muletoguxamozeg.pdfIn PDF document text
    • https://rusaxexuratibu.weebly.com/uploads/1/3/2/6/132680860/giwawifik-rabipibazemover-waweratamuwan.pdfIn PDF document text
    • https://xawizavikerid.weebly.com/uploads/1/3/4/5/134525990/vikanivepe.pdfIn PDF document text
    • https://zadujogor.weebly.com/uploads/1/3/1/4/131406982/5bae66f0f976.pdfIn PDF document text
    • https://lozofuxoxezutuw.weebly.com/uploads/1/3/5/3/135303337/34520fd72d756ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403271/normal_600fd8c5ba842.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/moduxanakuri/jack_and_the_beanstalk_short_story_moral_lesson.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_off0000e3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C4 5416 bytes
SHA-256: 1f499eb856112e38662b933b65f1a0ecb8b20d9d94700235ebaa0c5f8d44be3d
font_01_sfnt_off0000f61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61B 10280 bytes
SHA-256: 1eee213477a701075e580f21a1be73b273f303b1a3dfd0c3d31d995447858cb3