Malicious PDF — malware analysis report

Static analysis result for SHA-256 1938320c1bdcfade…

MALICIOUS

PDF

73.6 KB Created: 2021-06-03 15:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4371ce42e4cd12b8e19466fbefd08a13 SHA-1: e62a083418b5f0c3fa2b1bf295e45556a02db690 SHA-256: 1938320c1bdcfadeea5afbefab7ce3b92c73386fe0442ae2b06654f0ec3820f8
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, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

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://archism.ru/pbw?utm_term=miller+70+series+wire+feeder+owner%2527s+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368238/normal_605166287e160.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448986/normal_5fc82ca9001ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483851/normal_60357fc81980b.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4368741/normal_60b434745e04a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371005/normal_5fc7a2cec34a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366993/normal_604e81707f288.pdfIn PDF document text
    • https://pelunukemuf.weebly.com/uploads/1/3/0/7/130776607/gowaravo.pdfIn PDF document text
    • https://nepufetok.weebly.com/uploads/1/3/1/4/131438640/2271538.pdfIn PDF document text
    • https://pedasivu.weebly.com/uploads/1/3/5/3/135387907/277676.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366377/normal_6015d7b4e6b31.pdfIn PDF document text
    • https://lapadodipelij.weebly.com/uploads/1/3/1/1/131164402/jamifomulutumuvimez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417426/normal_601bf934ed345.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403264/normal_5fe3b2e65251c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449616/normal_5feebf1bc4ed3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461249/normal_5fe209bd8938d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://liwuvedesisu.pbworks.com/f/how_do_i_enable_previewer_in_outlook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/917ac741-b39f-490f-8511-e7a43d7f84a1/mojiresusomo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20507fcf-aa8a-4b2b-be12-82cb95fd6c70/hp_probook_450_g5_keyboard_light.pdfIn PDF document text
    • http://kakexigodelo.pbworks.com/f/where_can_i_get_my_sewing_machine_serviced.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b03e5b26-5419-4bab-a793-a81c6aa8367c/tom_clancys_rainbow_six_quarantine_ps4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3183c6ad-e80e-4ecb-b3ea-b06bd7c8924c/69445034713.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_off0000e249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE249 5404 bytes
SHA-256: 2f8a85c8528ff0baee4a107d98794fece9b91a2538e4ee46cce62bc942fbc798
font_01_sfnt_off0000f4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B9 10544 bytes
SHA-256: 03a4028652beeb6ee40c26a1aa1a10e9bc0decc2f0034d52bba49b879536d1e5