Malicious PDF — malware analysis report

Static analysis result for SHA-256 212bbceb77c2ce29…

MALICIOUS

PDF

63.3 KB Created: 2021-01-19 22:53:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 7a3c542c13e3c3e7715bac9a4c263c9a SHA-1: e8fe52c7adfbfdc1461f1dd6861841643b65f338 SHA-256: 212bbceb77c2ce29f3fca5544985c75b8eab3358ffcb6a0a366261122c63a08c
244 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains a large number of embedded links pointing to external PDF files hosted on various disposable domains, indicating a link farm or SEO manipulation scheme. One critical heuristic also flagged a link to known malicious redirector infrastructure.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?utm_term=la+fitness+plano+east+class+schedule In PDF document text
    • https://kejobogufepemis.weebly.com/uploads/1/3/0/7/130775396/vexegizojo_fumeguwi_julepawer_merasu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479916/normal_5fb5c0681bf07.pdfIn PDF document text
    • https://site-1171658.mozfiles.com/files/1171658/27028580273.pdfIn PDF document text
    • https://site-1198654.mozfiles.com/files/1198654/83691479877.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451019/normal_5fd5f4dd4b58a.pdfIn PDF document text
    • https://site-1166725.mozfiles.com/files/1166725/16199959706.pdfIn PDF document text
    • https://site-1176402.mozfiles.com/files/1176402/machine_input_output_questions_and_answers.pdfIn PDF document text
    • https://fugebigejajifad.weebly.com/uploads/1/3/1/4/131406613/wokupivuse.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423780/normal_5fd27e498f243.pdfIn PDF document text
    • https://fazapezipomen.weebly.com/uploads/1/3/1/4/131453522/08b22b356020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445338/normal_5faa2dc35fada.pdfIn PDF document text
    • https://site-1167942.mozfiles.com/files/1167942/sixilovuxuzunudabefam.pdfIn PDF document text
    • https://site-1197494.mozfiles.com/files/1197494/pro_series_drag_racing_twin_turbo_mustang_tune.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000baca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBACA 5088 bytes
SHA-256: 1515ba7808fa7cedd57826242b022db3480ad938f1ca9aba846996f869df267b
font_01_sfnt_off0000cc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1E 10616 bytes
SHA-256: 54c6ce2ddd71bb5db16ef596bb03d555ce0f6bde390ce71b74ed0643ccb51c91

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