Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c181a4393cf83e…

MALICIOUS

PDF

71.2 KB Created: 2021-02-20 04:42:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ab036350ad5423467e2c1fa0d707b0f7 SHA-1: ee78727d3c4551757992c8f215a231731c973de0 SHA-256: c4c181a4393cf83ef6d39035be8e2106dd68fce3facee02de3c9866f5f8edfcf
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one primary URL pointing to 'seumenha.ru'. This heuristic, combined with ClamAV detection and ML classification, strongly suggests a malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

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://seumenha.ru/strik?utm_term=top+100+drugs+2e+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408582/normal_6012507c8e281.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463788/normal_601960cf37d4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419654/normal_60305b9ecc948.pdfIn PDF document text
    • http://islemleriniz.org/97105163511yqb4y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426263/normal_601842c17ca21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490528/normal_5fd317611682f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403948/normal_601aef82cf4d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485572/normal_5feb66b53e859.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388038/normal_5fda31c1d679e.pdfIn PDF document text
    • https://gigawixirebasig.weebly.com/uploads/1/3/1/8/131857482/devibulaja-renabuz-misazanagaxevix-guzuwetokapotaz.pdfIn PDF document text
    • https://xasonametig.weebly.com/uploads/1/3/2/3/132303127/pomeragoverasaz.pdfIn PDF document text
    • https://nowefatitabawev.weebly.com/uploads/1/3/2/7/132740181/ef47d77.pdfIn PDF document text
    • https://dolunejasuvufa.weebly.com/uploads/1/3/0/7/130776008/palalezibag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419644/normal_60243c89820e2.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/jitimesolagun/explain_the_characteristics_of_useful_accounting_information.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/anatomical_terminology_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/nimabirufutejufulinu.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/limbo_pc_emulator_for_android_6._0.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/25534762587.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_off0000dae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE1 5240 bytes
SHA-256: 94c7e54fbca548968e79e557cca5ef0a2a735ea5482466ab01074518b0603fc7
font_01_sfnt_off0000ecd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD4 10368 bytes
SHA-256: 56ea30ecd3ac1840c8a155784392242547d0ce76378a4b4349b9b3ffa2d7189e

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