Malicious PDF — malware analysis report

Static analysis result for SHA-256 76f2fc32b03245e2…

MALICIOUS

PDF

97.3 KB Created: 2020-11-26 13:40:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: bf679f3cb3343779a0be2486d3d30e66 SHA-1: 924d1ff2319060775b91829e7bb83f15d7976b33 SHA-256: 76f2fc32b03245e20bf635afbdd01d06bab5d03a2c1c4e4fa36382c6878cacff
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a significant heuristic firing indicating a 'PDF_SEO_LINK_FARM' that points to a large number of other PDFs. One of the primary external URIs, 'https://traffset.ru/strik?utm_term=pathfinder+2e+core+rulebook+pdf+4chan', suggests a lure related to a game rulebook, likely to deceive users into visiting malicious sites. ClamAV detection and ML classification further confirm its malicious nature, classifying it as a phishing trojan.

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
  • 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.
  • 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/strik?utm_term=pathfinder+2e+core+rulebook+pdf+4chan PDF link annotation
    • https://tedumuwoke.weebly.com/uploads/1/3/1/3/131397970/007861d53b9db7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393898/normal_5f9f1125e9a97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407747/normal_5fa0555774668.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378607/normal_5f8c702189316.pdfIn PDF document text
    • https://tigatomexinopi.weebly.com/uploads/1/3/4/4/134460375/pobagapuvi-budov.pdfIn PDF document text
    • https://xofeboje.weebly.com/uploads/1/3/4/5/134584890/8513719.pdfIn PDF document text
    • https://damemerivojed.weebly.com/uploads/1/3/4/3/134378109/1839873.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fizup/16873843686.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/75802410818.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c93b194-44f6-4b12-af68-775b59e79de0/43742376441.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8c98404-3876-4270-91bb-7afb4666d41e/ingenieria_economica_riggs_bedworth_randhawa.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/parts_for_bowflex_treadclimber_tc5000.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/pixinow.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/bus_simulator_indonesia_games_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/amy_winehouse_frank.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000131bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BC 5372 bytes
SHA-256: b385dd2b9234a650a43276dfbd9d7fafcd3301d7affc995accad724778c62745
font_01_sfnt_off000143e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143E9 11184 bytes
SHA-256: ab3400e7091b1e02b52eb1d139d7c8c4ea4b65773328e4e6cd8b957db4b7eb3a
font_02_sfnt_off000169b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169B6 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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