Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b52bd36efab8f9…

MALICIOUS

PDF

67.3 KB Created: 2021-02-28 23:51:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 858a4ea43f9effee018cd34dc2f6bad5 SHA-1: d2f427bf013c167c8284538f57261ca6cc85c970 SHA-256: a8b52bd36efab8f9a1bc43b34f3b601d6c052c4135ce91dc4b815fd72a85a4b3
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content, aligning with a phishing or SEO spam attack pattern.

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://leonvi.ru/strik?utm_term=how+many+calories+in+4+pc+wendy%2527s+nuggets PDF link annotation
    • https://lixubirenolona.weebly.com/uploads/1/3/4/6/134669397/c0b8dfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377908/normal_603ad4895c9a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464710/normal_6029fe1a1ee8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445743/normal_600a3e7d39c2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387420/normal_5fd340d291645.pdfIn PDF document text
    • http://goladelexugezi.sportsontheweb.net/tevulazesedaxato.pdfIn PDF document text
    • http://cetop.xyz/a_writers_reference_freer3c13.pdfIn PDF document text
    • https://fiwisito.weebly.com/uploads/1/3/4/7/134715438/dumejadawe.pdfIn PDF document text
    • http://webcam-model.online/pukeruvebulotiwovulrzvu1.pdfIn PDF document text
    • http://instapresent.site/ronosogexekitoxomufop6v65j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412154/normal_600669635d9a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471512/normal_5fed7a3f2aa68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369629/normal_602744c3bb90c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484633/normal_5ff64b32a3d2e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tifilow.onlinewebshop.net/how_to_strip_demi_permanent_hair_dye.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/68257370093.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_off0000c8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D1 5668 bytes
SHA-256: 14968d68370fcf1c40f7d2c91adc380e0630ad1c683c2c8ea5fe5e6e4e586af3
font_01_sfnt_off0000dc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC32 10372 bytes
SHA-256: da2c4047d7acd28901fe15a73a2ce832d8cf41300f08077b6f0c10369c6cabb6

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