Malicious PDF — malware analysis report

Static analysis result for SHA-256 fafc1e9e2c9a0c4d…

MALICIOUS

PDF

84.0 KB Created: 2021-03-28 19:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f09dc1a203c4dca45ca2e942149944f6 SHA-1: 28035dd8e808d2dd6d30335d2a1e16570af3c454 SHA-256: fafc1e9e2c9a0c4d49e9a841a1a362fbf0b269bbf218cfe92e3ff8ec831d21a4
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://druttle.ru/strik?utm_term=yard+machine+lawn+mower+not+starting PDF link annotation
    • https://federadedeladol.weebly.com/uploads/1/3/4/6/134626130/fowetadapodojijal.pdfIn PDF document text
    • https://peniwifagupe.weebly.com/uploads/1/3/0/7/130738894/234bc49.pdfIn PDF document text
    • http://inostrana.com/99112359354cpm2w.pdfIn PDF document text
    • http://datinge.site/how_to_mute_panasonic_microwavece314.pdfIn PDF document text
    • https://xoluvujotu.weebly.com/uploads/1/3/1/0/131070376/weravudi.pdfIn PDF document text
    • https://munuteme.weebly.com/uploads/1/3/4/8/134862418/xudazi.pdfIn PDF document text
    • https://lisobigu.weebly.com/uploads/1/3/1/6/131606175/7ae66.pdfIn PDF document text
    • http://skameyki.club/pimafapubuxikevu4plv7.pdfIn PDF document text
    • http://astropsychology.website/how_to_learn_woodworking_esomuvwk.pdfIn PDF document text
    • http://rcasino.info/2010_dodge_caliber_dash_light_meaningsvwk4m.pdfIn PDF document text
    • https://rizimajapalikum.weebly.com/uploads/1/3/4/6/134633575/pigawowiki.pdfIn PDF document text
    • https://xutawolovunoka.weebly.com/uploads/1/3/0/7/130739399/7151964.pdfIn PDF document text
    • https://variwigegepug.weebly.com/uploads/1/3/4/3/134348450/b9e58d2f4d09.pdfIn PDF document text
    • https://serirufudo.weebly.com/uploads/1/3/4/7/134712976/jukevuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/siwixomudit/74634480485.pdfIn PDF document text
    • https://ad177677-9664-42cd-9bf2-17a10eef6e1d.filesusr.com/ugd/f8915e_13f7e3d5e1d54a7c84655f0034ec2858.pdf?index=trueIn PDF document text
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_3029f1eba3b94b4f8a43ea5d0c5a5da8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/genijusemu/ligileverowopulale.pdfIn PDF document text
    • https://933527c5-e005-4225-a3aa-05fee46c7696.filesusr.com/ugd/b51dd5_dc76d0c2d7ee4f2bb6e223c3e70e83c5.pdf?index=trueIn PDF document text
    • https://366cd995-4ddf-4220-a197-7cea849caf0e.filesusr.com/ugd/947062_0ebbd59f41644acaaa90cc0b3bd160a6.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10935 5408 bytes
SHA-256: 70576c527b3fe9076a8dd05bb365f8b889f793ca9f67731929a75f675dcc0666
font_01_sfnt_off00011b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7F 11796 bytes
SHA-256: 57de4fe2ea97599cc7216d2958752d326c33e17093ac2da259227a768bb92c59

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