Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a76f72c3f1834b…

MALICIOUS

PDF

68.7 KB Created: 2021-01-16 09:41:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 2e3c7c5ac3cd4c3947ca021901d34ace SHA-1: d35d046ea2544a43cc8b4dac03171f72973e3a0c SHA-256: 83a76f72c3f1834b8d42be6f2d8ab3a24f01211f03f7d839d4d73b7ac16c7d05
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The primary URL, 'https://traffnew.ru/123?utm_term=is+it+legal+to+swear+in+public+uk', indicates a lure to a specific search query. ClamAV detection and ML classification confirm malicious intent, likely related to phishing or malware distribution.

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://traffnew.ru/123?utm_term=is+it+legal+to+swear+in+public+uk PDF link annotation
    • https://site-1168332.mozfiles.com/files/1168332/ryan_s_world_ipad_wallpaper.pdfIn PDF document text
    • https://site-1245131.mozfiles.com/files/1245131/the_carmichael_show_script.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416153/normal_5ffbcfc16b59a.pdfIn PDF document text
    • https://site-1174819.mozfiles.com/files/1174819/43400231020.pdfIn PDF document text
    • https://gozisali.weebly.com/uploads/1/3/4/6/134670052/ca7faeea22.pdfIn PDF document text
    • https://mibugekokedepi.weebly.com/uploads/1/3/2/6/132682655/d1790bad63b54.pdfIn PDF document text
    • https://sunivisoxeban.weebly.com/uploads/1/3/4/4/134493344/mifapetogemonokikugi.pdfIn PDF document text
    • https://wobomiti.weebly.com/uploads/1/3/4/5/134501920/a640a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484399/normal_5fb2a704ab37e.pdfIn PDF document text
    • https://site-1175091.mozfiles.com/files/1175091/japipumixaw.pdfIn PDF document text
    • https://site-1166042.mozfiles.com/files/1166042/tanix_tx9_pro_user_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366020/normal_5fb8b16e433b8.pdfIn PDF document text
    • https://baxukeze.weebly.com/uploads/1/3/0/8/130874478/mulana.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/mogipegi/electrical_safety_certificate_template.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_off0000d0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B2 5336 bytes
SHA-256: 6ba16d1fc38ca87f727e8751f9a85288754fc8cba67bdd66cee57c15ca9b4666
font_01_sfnt_off0000e2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F9 10388 bytes
SHA-256: 0aa51992f950574d296b7f6fd3d7786b08db60c044f62100f9b402bc3a4b5959

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