Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c20f8faf1550165…

MALICIOUS

PDF

79.8 KB Created: 2021-05-23 12:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3ae3686b3c5cc527540ac7d06602ad58 SHA-1: 12dfdc99058a1fbad610a586122cf876adff1ced SHA-256: 0c20f8faf155016569c572ce6d423b70983bce531ba950e4b3c86cb4f82cf0bd
206 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://golowaki.ru/strik?utm_term=how+to+set+pin+for+pandemic+ebt PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444644/normal_6022b3ffa2d44.pdfIn PDF document text
    • https://sixofufi.weebly.com/uploads/1/3/4/3/134375841/lileli-viluki-pabob-wanotokojod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369505/normal_6039f2d79f035.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406812/normal_60122afb0205b.pdfIn PDF document text
    • https://serarabasujuz.weebly.com/uploads/1/3/1/6/131606617/4de5cd36d46bc8.pdfIn PDF document text
    • https://latitidazus.weebly.com/uploads/1/3/4/0/134018806/degolutevijif_kofimumovix.pdfIn PDF document text
    • https://mefiremen.weebly.com/uploads/1/3/0/7/130776246/2291003.pdfIn PDF document text
    • https://simokenuma.weebly.com/uploads/1/3/5/3/135311421/7415645.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407552/normal_601134ea7afbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366980/normal_6017cd2f3cafe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481065/normal_603a03f138a32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444850/normal_604bbcfa591ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454671/normal_605fa40fcab11.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/04f41acb-4b2d-42db-9559-9dcc888a221f/manufacturing_planning_and_control_for_supply_chain_management_the_cpim_reference.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c925ff67-f75c-4968-b3f0-07522e2208b6/how_to_use_nespresso_lattissima_touch.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/9212129795.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/dotuzegajizariwalota.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/x7r_ceramic_capacitor_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/psychoanalytic_theory_freud_and_erikson.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_off0000f85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85C 5464 bytes
SHA-256: 978b914bbb9e204c5bb383f6420c5d0131a9f3e74f2616a1449ea131e0299342
font_01_sfnt_off00010ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE3 11364 bytes
SHA-256: ec412d8d71d3af0d6366f37ef42cdec1890aa8917145512772598a99712352cf