Malicious PDF — malware analysis report

Static analysis result for SHA-256 fec0dc37b68f27a7…

MALICIOUS

PDF

65.8 KB Created: 2020-12-19 00:49:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 89d0d86e3997ffad6e299f38a7c23f46 SHA-1: 2e82a72ca3faacc48ebb216ecc51eb3cae8f6630 SHA-256: fec0dc37b68f27a7b2243097428ef4f681afc5919baa6b4dcff112bc2787e90d
214 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including critical alerts for being a malicious redirector and containing a link farm. The ML classifier also strongly indicated maliciousness. The embedded URL points to a known malicious redirector, suggesting an attempt to lure users to a phishing or malware distribution site. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffking.ru/aws?utm_term=noviform+augensalbe+3 In PDF document text
    • https://woduluzotuni.weebly.com/uploads/1/3/4/3/134373450/788994f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393186/normal_5fc2fdca9f9b3.pdfIn PDF document text
    • https://tovuwopisivid.weebly.com/uploads/1/3/4/6/134640328/bufotolozunulox-zopufob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371005/normal_5fbdd7eca3e09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368788/normal_5f8bc73f57216.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0d650403f5353fd956949/t/5fc1c8023c6ccf69f3a004f5/1606535170610/72317549588.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61d239fc-5be7-4c35-aa87-97a563ade4c6/ruzoz.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3660e8787e879897bde4b/t/5fc4e8526457125654d5b7c5/1606740051152/42455518.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15dcaae4-ccff-48f4-9bca-4512ab757181/15327241615.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb8f1d1a-8b3d-4024-92b5-59dc5e131cbb/35872366249.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b41c157-554c-47ed-82e6-34cd024b412d/rogue_trader_koronus_expanse_map.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5088aa5bc066edfc02720/t/5fd652c2491a58544a0ed355/1607881412576/34451590727.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_off0000c312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC312 5420 bytes
SHA-256: 147a893ab2a382d75f9f5eef973f606c609b8df7bc0c1a95ca78578523de4b64
font_01_sfnt_off0000d581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD581 11192 bytes
SHA-256: 1bc4f493ca5426fffaad526abb7e5a0015f4e3efcee4c2a6f0cd3eae0290339a

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