Malicious PDF — malware analysis report

Static analysis result for SHA-256 0325e633c26c997f…

MALICIOUS

PDF

72.9 KB Created: 2021-02-13 04:37:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a0ec8ad9c319828304f93f7e8cdd25a6 SHA-1: a483bad0476983c1da28759ad24faf32803aca11 SHA-256: 0325e633c26c997f00e9ba611588553a88b00f46d10ef655824cd7e9146d6151
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly suggests malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious redirection or content hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://bologen.ru/wix?keyword=idek+tbh+meaning PDF link annotation
    • http://hopecommunitynaz.com/33363759672jaiby.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/Vjh5ogj/48228806203.pdfIn PDF document text
    • https://labekefetimobu.weebly.com/uploads/1/3/0/7/130739294/9462292.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443821/normal_5fd8a04ddc2b8.pdfIn PDF document text
    • https://cdn.sqhk.co/texekikevow/iGf7ijt/high_volume_ringtones_for_samsung_j7_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476593/normal_5fe782394b1b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452382/normal_602474d8d4181.pdfIn PDF document text
    • https://gitumakiwu.weebly.com/uploads/1/3/1/4/131437138/0c0e02cfa79344.pdfIn PDF document text
    • https://cdn.sqhk.co/dijowasedop/XMugjfv/movies_on_netflix_right_now_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/mujowofapubi/hgKRIic/gods_of_rome_pc_hack.pdfIn PDF document text
    • https://tigewatujuw.weebly.com/uploads/1/3/0/7/130738543/6598d68ba18.pdfIn PDF document text
    • https://kalaxokesipak.weebly.com/uploads/1/3/4/8/134888683/2775119.pdfIn PDF document text
    • https://cdn.sqhk.co/kawinojos/dBTWgfZ/blackjack_21_endless_free_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/livefivepa/hejgNge/blundstone_waterproof_boots_mens.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gatinilub.epizy.com/ivory_sheets_a4.pdfIn PDF document text
    • http://govogudumig.epizy.com/autopsy_2008_full_movie_hd.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB5 5072 bytes
SHA-256: aeabc9e1cfd338f80e348663de409cc6cc1c36e91e0b87d605e8a9cbe6f2d72a
font_01_sfnt_off0000f0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D5 11228 bytes
SHA-256: bd147f2b08effac31efaea05186916730598f68601f1a222a95974ee9ab353a1

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