Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dbf126afe61e08e…

MALICIOUS

PDF

96.7 KB Created: 2021-01-06 08:25:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f3bb057bcb5b045ec30b72a03ddd7838 SHA-1: 5aa1d08bee2ffcf54e22e6323080a498f5d7880f SHA-256: 8dbf126afe61e08ed90362cce40779ee2b7e0535f04ef870f5cfe0923b817b3f
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file exhibits characteristics of a link farm, with numerous external URLs pointing to various PDF documents, many hosted on disposable domains. The document body, though heavily obfuscated, contains keywords related to financial planning and retirement, suggesting a lure to attract users to these external sites. The presence of ClamAV detection and ML classification strongly indicates malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffset.ru/123?utm_term=cashing+in+on+the+american+dream+how+to+retire+at+35+free+pdf PDF link annotation
    • https://gajegebukorivip.weebly.com/uploads/1/3/4/4/134487765/menopamuzop.pdfIn PDF document text
    • https://tekopazaxalar.weebly.com/uploads/1/3/4/3/134348639/df3df4e80b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420903/normal_5fce74983e55e.pdfIn PDF document text
    • https://nububoreral.weebly.com/uploads/1/3/4/4/134467099/5926953.pdfIn PDF document text
    • https://molapoji.weebly.com/uploads/1/3/4/0/134096941/nuwunixuvepuxoz.pdfIn PDF document text
    • https://lixaworone.weebly.com/uploads/1/3/1/8/131871871/fewig.pdfIn PDF document text
    • https://poxuroli.weebly.com/uploads/1/3/0/7/130738943/910834dd0.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/04a8ee00-4b8b-40a8-8758-13e8b0108cb4/it_director_resume_samples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c73701fc-83bd-4bc8-9a7d-d63bfbd83ab2/aggregation_in_java_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5cddb38-8968-474d-a876-9b10a1fa84d0/parkersburg_wv_police_records.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/92683312079.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_off00013bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BCD 5824 bytes
SHA-256: 41ca1656c2578158a31a3c6d4dcc5b73adb75edba934ded44011eabe15996200
font_01_sfnt_off00014f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F89 11212 bytes
SHA-256: 2f127fb755cacc14433f6e71afdb370bbb7508086b92eb083bd85bbb90bea853

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