Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c046e86f19cf34…

MALICIOUS

PDF

84.3 KB Created: 2021-04-08 22:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e9ed9377345f8bcd86b81349ccb656df SHA-1: 59258b5109cba51cec3783b0deace1c1de734087 SHA-256: 42c046e86f19cf34dfdcb4b9e8506dc1ef0b2397e73f46c1f2ef264b0e258703
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links suggests a potential distribution vector for further malicious content or phishing attempts. No scripts were extracted, but the structure and heuristics point towards a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://resalured.ru/strik?utm_term=how+big+is+english+vocabulary PDF link annotation
    • http://raboleziwuga.iblogger.org/49054461546.pdfIn PDF document text
    • http://rajukilodagoje.mygamesonline.org/puvilalema.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458623/normal_6051fd651cc9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482631/normal_606972552d49c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492259/normal_5ff377eb77786.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496853/normal_602072a82038f.pdfIn PDF document text
    • http://bokazisenu.22web.org/android_tv_1080p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410015/normal_604724053603e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402014/normal_5fce7d3135eb1.pdfIn PDF document text
    • http://subumobo.22web.org/vemewapojazowatoba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483854/normal_604c9f438da76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454049/normal_605210b21c379.pdfIn PDF document text
    • http://fibutogu.mywebcommunity.org/detetoga.pdfIn PDF document text
    • http://radapox.iblogger.org/chromatic_harmonica_lesson.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384152/normal_5ff4e7e5db01a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479933/normal_601336789f403.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kimogule.epizy.com/hayward_pool_filter_error_codes.pdfIn PDF document text
    • http://vubelifijam.atwebpages.com/craftsman_18_hp_ohv_intek_oil_change.pdfIn PDF document text
    • https://02ee9779-94d6-4ec7-959f-c0f99fe19a35.filesusr.com/ugd/cdc607_048426e882184f7a82bebca4a0681ecb.pdf?index=trueIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_9d5ef05780234261a8ef97763b2fe767.pdf?index=trueIn 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_off00010b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4A 5416 bytes
SHA-256: dda9a9855db11d97f77ae04db5897e263b544fb21b0f7d1a8de047958029e06c
font_01_sfnt_off00011dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD7 11516 bytes
SHA-256: fa124b3f3a96dc8de83ec7e3ebb165899a2c358f4026864d7537a02f50f6ee5d

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