Malicious PDF — malware analysis report

Static analysis result for SHA-256 a47ab9ee9fe91888…

MALICIOUS

PDF

79.9 KB Created: 2021-05-02 00:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 666d1fc9c07c6d6652af4c5f45c8c664 SHA-1: c9d6cacf5a26919bd88473356830c97d360749a3 SHA-256: a47ab9ee9fe91888979516454588cf663a6b88b3d89ba94c1b13a8c6dca277cc
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicating it functions as a link farm. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent, with many links pointing to disposable hosting. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a distribution point for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/strik?utm_term=stained+glass+window+art+project+tissue+paper PDF link annotation
    • https://tidopotixasajev.weebly.com/uploads/1/3/0/7/130738881/givis.pdfIn PDF document text
    • https://zuzivosojix.weebly.com/uploads/1/3/0/7/130775151/db11d77227dad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417418/normal_5fd9f726a7dc6.pdfIn PDF document text
    • http://zeludupixejufi.medianewsonline.com/behind_the_bars_brittainy_cherry.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456140/normal_6050d8c7c0d7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500425/normal_602a2016522b7.pdfIn PDF document text
    • http://zuzorovix.scienceontheweb.net/jaws_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449602/normal_603943891e16a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446151/normal_60190f1c3ad72.pdfIn PDF document text
    • https://fugunukotuji.weebly.com/uploads/1/3/4/5/134589730/24ea2290115a75.pdfIn PDF document text
    • https://vaxinukosiju.weebly.com/uploads/1/3/4/6/134625250/1530c20b635130.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421205/normal_5fd0940ae03f8.pdfIn PDF document text
    • https://xagomutub.weebly.com/uploads/1/3/4/3/134321984/wowumefokem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463543/normal_5ffebd2bad8a7.pdfIn PDF document text
    • http://zimezobot.getenjoyment.net/pivifopanixafalakij.pdfIn PDF document text
    • http://wivikaxebox.medianewsonline.com/besogopoka.pdfIn PDF document text
    • http://xokezuwadem.mygamesonline.org/buganda_kingdom_history.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/mavixu/undefined_symbols_for_architecture_x86_64_c_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/hisense_40_s4_fhd_smart_led_tv_review.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/samiredug.pdfIn PDF document text
    • http://valupakukav.myartsonline.com/95026156630.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/tujovekikog.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_off0000fa7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7A 5512 bytes
SHA-256: 57b08b616845b7d3aae242ec448381a00dbf1d2243965777924083314489dc3a
font_01_sfnt_off00010d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5E 10832 bytes
SHA-256: 418099a616086cc82110cada0a89e295c9db58c4df3fc473ac30814015b1b509

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