Malicious PDF — malware analysis report

Static analysis result for SHA-256 4781199b7e143ebd…

MALICIOUS

PDF

71.2 KB Created: 2021-02-14 12:52:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8dd42d5e9f6a1e7c1a0900f23577076e SHA-1: d93b83820defe91781d985d0d84e4d67e835e128 SHA-256: 4781199b7e143ebd82cc1d2a30f9194c72d41da0b269906349f4ecd34aa1e8ae
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, many of which point to disposable domains and are likely used to host malicious content or redirect to phishing sites. The document body, though heavily obfuscated, suggests a lure related to software tutorials, which is a common tactic for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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
  • 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/wb?keyword=aspen%20hysys%20v8.%208%20tutorial%20pdf PDF link annotation
    • http://babbieshop.ru/joint_photo_frame_appw9d0a.pdfIn PDF document text
    • http://frontglass.xyz/liluvesovewinumulhq2f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402488/normal_601113e092cf7.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/ZjbGXje/gravity_ninja_telegram_hack.pdfIn PDF document text
    • http://doordash.link/meet_bros_cham_cham_ringtonew3mf4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388271/normal_5fde264cd5561.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvazilu/gjdeiif/70500290618.pdfIn PDF document text
    • https://nesibebinirudeb.weebly.com/uploads/1/3/5/3/135311353/100831682e69c89.pdfIn PDF document text
    • https://jesisime.weebly.com/uploads/1/3/4/8/134886507/2245930.pdfIn PDF document text
    • https://gamajebijapam.weebly.com/uploads/1/3/1/8/131856653/leperuxor.pdfIn PDF document text
    • http://hd-cam-mirror-up1.club/27572781445mbrir.pdfIn PDF document text
    • http://bbbbbbbbeeee.space/38785315755aevx7.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/kifutizijebuj/55399212821.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/75201996630.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/lockout_tagout_procedure_template_free.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F6 1560 bytes
SHA-256: 3c26a8223f1d007b35d3fc63bb968b1244831692f8a9bdddcfea4213fe8ed82d
font_01_sfnt_off0000cce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE7 5388 bytes
SHA-256: 609d28bdd9b4c0e8514c1ae848e0803e7ad5eb687ddcd2c38cbdc4f45864b1d3
font_02_sfnt_off0000df3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3A 9868 bytes
SHA-256: ec8e4a434c7e4d0f173cc317bf10912cd4a30c3bf8be032edbb8cf756e22bd1d
font_03_sfnt_off00010113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10113 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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