Malicious PDF — malware analysis report

Static analysis result for SHA-256 817864ef70f1a21a…

MALICIOUS

PDF

73.7 KB Created: 2021-06-03 07:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a654cbd3fada643ddd05d8690d57bb23 SHA-1: 7de4b53e67c810e0adb3c17f14e10b67dcae7b0c SHA-256: 817864ef70f1a21a06c8a6813a77fb4ff5d2cb6e43903edd0661cd495cab34d6
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a primary URL pointing to a suspicious domain that appears to be part of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/123?utm_term=one+way+lyrics+and+chords+pdf
    • https://static.s123-cdn-static-d.com/uploads/4503584/normal_60b791c1f0212.pdf
    • https://pinejose.weebly.com/uploads/1/3/4/4/134467182/3118708.pdf
    • https://kegazesawatodo.weebly.com/uploads/1/3/4/3/134378031/sazirotejuwevoz.pdf
    • https://bevufifebuseve.weebly.com/uploads/1/3/1/8/131855995/2c70897c414a44e.pdf
    • https://zulewawasukuxu.weebly.com/uploads/1/3/4/5/134581955/pokanu-wogefuvepipeg.pdf
    • https://cdn-cms.f-static.net/uploads/4414688/normal_606a916682a1e.pdf
    • https://bulasenojagaroj.weebly.com/uploads/1/3/4/3/134357248/nuvajowa.pdf
    • https://tafebitekule.weebly.com/uploads/1/3/0/7/130776603/bagibejefep_xujilemobib.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tusawijer.pbworks.com/w/file/fetch/144464205/charitable_trust_deed_format_in_word.pdf
    • https://uploads.strikinglycdn.com/files/306ebf28-cb90-4488-a1ed-d573f1433ded/introduction_to_biblical_interpretation.pdf
    • https://uploads.strikinglycdn.com/files/ade0ab5d-9877-4522-8e56-ee1d8c31c4fc/cirrus_sr-22_parts_catalog.pdf
    • https://uploads.strikinglycdn.com/files/afcf180a-a385-43f1-bac1-175219ad7354/gipatarewivajofomi.pdf
    • https://uploads.strikinglycdn.com/files/ad04233c-b715-457d-87b9-5c242c1be76e/83444239386.pdf
    • https://uploads.strikinglycdn.com/files/9c5bc609-127d-4dba-81f4-ee8bebf7788b/bapu_tera_ladla_mp3_ringtone_download.pdf
    • https://uploads.strikinglycdn.com/files/dcdcfa6e-8329-411e-ae38-43b2931499ca/10416173188.pdf
    • http://juwelite.pbworks.com/f/80146489787.pdf
    • https://uploads.strikinglycdn.com/files/6da77923-cdde-4f45-a1b4-1050d25168bb/wulagasede.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e19e.bin
7cd1cb5475f58d10bdf153ccc52255e4f9c7ca361031b102ecde08595da0feb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE19E 5464 bytes
font_01_sfnt_off0000f440.bin
dc76ed596a7d38647cbde70aabf16a5955364a24af40bf10d8950d3983bf0c0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF440 11136 bytes

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