Malicious PDF — malware analysis report

Static analysis result for SHA-256 0587c49cfd0b867e…

MALICIOUS

PDF

68.1 KB Created: 2020-11-25 22:03:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 06d975b34224cebc638b9ed495c0a27c SHA-1: 2c37247ecba35cabec5c8c12c773cdaa415dc4d3 SHA-256: 0587c49cfd0b867e68d8cb43ae07e0e0fd748f2903b3dc10b1f83be4cd315ff6
214 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of 'fire warden helmet stickers' in the document body, combined with the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics, indicates a lure for potentially malicious content. ClamAV detection and ML classification further support its malicious nature, likely serving as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://traffnew.ru/strik?utm_term=fire+warden+helmet+stickers PDF link annotation
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/tigav-keponomisisize-nuwimulaxa.pdfIn PDF document text
    • https://sozipufejelaj.weebly.com/uploads/1/3/4/3/134352325/tabizakiwanet.pdfIn PDF document text
    • https://jiwadurator.weebly.com/uploads/1/3/0/7/130776405/gitiwebopusose.pdfIn PDF document text
    • https://juragubiv.weebly.com/uploads/1/3/0/8/130874328/3217034.pdfIn PDF document text
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/puxup_palufubajel_pinubov_mixepojew.pdfIn PDF document text
    • https://tebefatudu.weebly.com/uploads/1/3/4/3/134329870/fe42a2d.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/1e30dd08-6430-4866-9b55-01599d1d0fb8/jazofetafezo.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/wilson_and_fisher.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a006d47-4de7-417e-8836-3884f09d371e/lasalle_council_bsa_org.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7169d17b-49b7-47e0-b4f4-a82482602835/90174971370.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d288ceb-c35c-42fe-a2cf-383dc98ac935/killing_floor_2_demolitionist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5350dad4-9103-4f2e-a516-d095ba12917b/barbie_pony_tale_full_movie_in_engli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf4cb328-c81e-4463-bb99-97dcbe5d491c/wotajuwevudazobi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54363c61-018c-42ad-9707-7e568ae37711/pebefube.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_off0000cbd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD1 5292 bytes
SHA-256: 00e7e3879f43265714af51324b36856891192b3e87eca02d4c9a84f2b39a0879
font_01_sfnt_off0000ddb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB4 11096 bytes
SHA-256: 85829415cfdc089f64024b1b799846f8657ec07ceb45f7857e8c991f33ececab