Malicious PDF — malware analysis report

Static analysis result for SHA-256 46765b7691b9db1a…

MALICIOUS

PDF

80.2 KB Created: 2021-04-20 14:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c5fb22173dabdb25f18b40bb99700d9 SHA-1: ea636fad9d733995c0d8acb58a6f6936ee3dce73 SHA-256: 46765b7691b9db1aeee039abe87bd046a9fd28b58e9ad6bed65b944734d51c4d
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used to redirect users to malicious websites for phishing or malware downloads. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/strik?utm_term=trigonometric+equations+class+10
    • https://cdn-cms.f-static.net/uploads/4465559/normal_6066b04702b75.pdf
    • https://vupebuxotilejo.weebly.com/uploads/1/3/0/8/130814562/towerajusotod.pdf
    • https://lorajezaked.weebly.com/uploads/1/3/4/3/134367433/1754346.pdf
    • http://xtreme-sport.ru/3573787817pzirq.pdf
    • https://cdn-cms.f-static.net/uploads/4405654/normal_603305cb526d5.pdf
    • https://bezofaxifi.weebly.com/uploads/1/3/1/6/131606652/gorovavikab-ravaj.pdf
    • https://tamoniwezetiro.weebly.com/uploads/1/3/5/9/135961995/2a5714f2174a50.pdf
    • https://cdn-cms.f-static.net/uploads/4382976/normal_605548dba86bc.pdf
    • https://static.s123-cdn-static.com/uploads/4379233/normal_5fcbbbf288470.pdf
    • http://runojiwum.getenjoyment.net/zumirubujobuvikipi.pdf
    • https://cdn-cms.f-static.net/uploads/4420905/normal_604f90861cc52.pdf
    • http://irisca.online/how_much_does_a_lift_technician_earng178h.pdf
    • https://cdn-cms.f-static.net/uploads/4374379/normal_60315c2fcbdaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://6a543b89-810f-4a07-932c-4cc129fc401a.filesusr.com/ugd/1e5726_491631a63e2b44658014184e7a121ba0.pdf?index=true
    • https://944bcc21-9f45-42c2-9889-8cf837fa5d1c.filesusr.com/ugd/50f869_aae65511a4dd4d6fb22a98d0b884ed59.pdf?index=true
    • https://2a1457bb-a4d2-449b-8914-d784a503a6da.filesusr.com/ugd/c0fca2_d56f2df46d984f8080c122d0d12a88a3.pdf?index=true
    • http://lopakesuzuw.atwebpages.com/negujiwumuziburufakon.pdf
    • http://pizitibasowu.atwebpages.com/how_to_run_workshops_training.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebd4.bin
92cf7abfdae707b0e7fe3a5a787ee12a6d86750676056774e99dc519d63ee4e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD4 5268 bytes
font_01_sfnt_off0000fda1.bin
f1de40422420b0c804b3befb0ca63722c580a9fd7a0359428b386b36118c2ee0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA1 11056 bytes
font_02_sfnt_off0001239d.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1239D 4324 bytes

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