Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9cc0c93259a278d…

MALICIOUS

PDF

94.2 KB Created: 2021-04-14 10:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 240708ed1577a2ab7abaee2b8bdd5386 SHA-1: 11ede293febc44e4eab535c75cc928142e5ade67 SHA-256: a9cc0c93259a278d9f58ca9507a17cc5aa16ec7583522d152f179bcc06f8209b
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 spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://jumiwimov.ru/strik?utm_term=do+skullcandy+crushers+work+with+ps4
    • https://cdn.sqhk.co/pirujezexod/ohbtDii/61008136193.pdf
    • https://binazinir.weebly.com/uploads/1/3/4/1/134108718/ca6af3e47499bb0.pdf
    • https://jasefeneg.weebly.com/uploads/1/3/4/4/134489721/0285cfd211c0.pdf
    • https://fiwigerisen.weebly.com/uploads/1/3/1/4/131408459/kavinasubeju-juxazab.pdf
    • https://vunepixas.weebly.com/uploads/1/3/1/4/131483778/447041.pdf
    • https://bipixivosebik.weebly.com/uploads/1/3/4/5/134516267/a8cd8e1b0a.pdf
    • https://toxavikosas.weebly.com/uploads/1/3/4/4/134437834/buwolaloj.pdf
    • https://cdn.sqhk.co/burexewejam/jfEiaQq/ben_coloring_ultimate_1_0_alien_in_tamil.pdf
    • http://risozeretelefa.22web.org/92222398839.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/fujadabez/julius_caesar_death_painting.pdf
    • http://madanekobovuge.epizy.com/fegagidizigada.pdf
    • http://xanojeja.rf.gd/foxabojutedurinalakixu.pdf
    • https://s3.amazonaws.com/fukepez/koxufoxubebudolazijuxanut.pdf
    • http://tanazutoja.rf.gd/xeluzipororobibaroj.pdf
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_70793d93ac7c4e70b12f3363ecc23ff6.pdf?index=true
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_74a9d5a584384775b5b69ff8c6dc261e.pdf?index=true
    • https://s3.amazonaws.com/bomupi/why_is_my_hp_envy_4500_printer_printing_blank_pages.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_off00012631.bin
67c01f1246494a965d3368d90371643bd887de3e4a9ae7b11c8b214365ce4d2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12631 5388 bytes
font_01_sfnt_off00013899.bin
d06c50f08fc1a979d3a701af72632c6e7a52839aad2200c73308d17d3b441ff1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13899 10888 bytes
font_02_sfnt_off00015d9a.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15D9A 4324 bytes

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