Malicious PDF — malware analysis report

Static analysis result for SHA-256 76913add2e9b0a70…

MALICIOUS

PDF

67.6 KB Created: 2021-03-23 00:30:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5f7cd8f9c2b9f4975661e4d5d47ed3d SHA-1: 47fd2f8513a9f557d4a7cd4586833aa98bc4a49e SHA-256: 76913add2e9b0a7021ee7e0e0c0d47bbf179929f16a29805cae6d03f15860f4e
124 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable hosting, suggests a link farm designed to redirect users to potentially malicious content or phishing sites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8239

Heuristics 4

  • 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 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://crophysi.ru/aws?utm_term=ge+dehumidifier+50+pint
    • http://reborasiruv.iblogger.org/the_x_files_episode_guide.pdf
    • https://kozoniwapi.weebly.com/uploads/1/3/4/0/134016697/8637580.pdf
    • http://wemepena.iblogger.org/toxowunof.pdf
    • http://wizuvadidena.iblogger.org/catchment_area.pdf
    • https://zativazu.weebly.com/uploads/1/3/4/5/134586929/9843582.pdf
    • https://fiwugoxatalaj.weebly.com/uploads/1/3/4/4/134498599/7397284.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://saduxax.epizy.com/palula.pdf
    • http://tuxavilewik.rf.gd/microsoft_certification_path_guide.pdf
    • https://uploads.strikinglycdn.com/files/3ebe2ab3-5c66-4a45-8010-2b0bc98a62cc/romance_sans_paroles_mendelssohn_partition.pdf
    • http://fasuper.rf.gd/pabomoge.pdf
    • http://malukofe.rf.gd/6322954429.pdf
    • http://nobugurunujut.epizy.com/how_to_read_automotive_wiring_diagram.pdf
    • https://uploads.strikinglycdn.com/files/b84bcedc-b194-49c8-a088-a84e2b9b76a3/tommy_igoe_groove_essentials_dvd.pdf
    • http://tubupokus.rf.gd/81645902903.pdf
    • https://uploads.strikinglycdn.com/files/5fe050dd-0ab3-4691-aaea-d7fc696d9de6/breville_smart_oven_pro_air_fryer_bov900bss.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1c4.bin
9dc0f6e91f082f9c871d79f9071d94f1f14c78d40005489e0c169a7b88dd0b57		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C4 5160 bytes

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