Malicious PDF — malware analysis report

Static analysis result for SHA-256 93e30c1898278a10…

MALICIOUS

PDF

69.5 KB Created: 2021-02-27 03:14:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1478bc1be6eb4691a2e18082cd64f7ba SHA-1: 9127f7844151485b2c0e7142dec2a2b2702e094c SHA-256: 93e30c1898278a1075feed89f0a48ca87e43387fb4732a4c64b7e23d0bcae8d5
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a significant number of external links, identified as a link farm. Several heuristics indicate this is a SEO link farm on disposable hosting, and ClamAV detected it as Pdf.Phishing.Trojan. The presence of numerous external URIs suggests an attempt to direct users to potentially malicious or phishing websites, aligning with spearphishing attachment tactics.

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://leonvi.ru/strik?utm_term=loading+ryobi+airstrike+stapler PDF link annotation
    • https://cdn.sqhk.co/zaperarori/RieheAx/original_donkey_kong_game_unblocked.pdfIn PDF document text
    • https://dataremidesop.weebly.com/uploads/1/3/4/6/134697992/4c8c29e3340.pdfIn PDF document text
    • https://cdn.sqhk.co/xobadata/jf3M7gE/diy_paper_crafts_easy_for_school.pdfIn PDF document text
    • https://cdn.sqhk.co/pasededi/zicic9A/24256247240.pdfIn PDF document text
    • http://mavigawika.scienceontheweb.net/warm_bodies_2013_trailer.pdfIn PDF document text
    • https://zopatiselinijil.weebly.com/uploads/1/3/4/7/134758238/7407175.pdfIn PDF document text
    • https://cdn.sqhk.co/munuluxel/qCibWjj/93808940313.pdfIn PDF document text
    • https://cdn.sqhk.co/mibupufek/TiiPfid/17198416545.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/ichjeic/mozamaxujaf.pdfIn PDF document text
    • https://cdn.sqhk.co/senuziker/jczvmja/52624515945.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/how_to_install_a_clothes_dryer_outlet.pdfIn PDF document text
    • https://lotopunukulel.weebly.com/uploads/1/3/4/4/134473418/pavoresufomasoze.pdfIn PDF document text
    • http://fezanabuxa.22web.org/nuwemixifonajigajozinirez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390373/normal_600f76c76074d.pdfIn PDF document text
    • http://wumewil.sportsontheweb.net/how_to_make_a_hamster_house_with_popsicle_sticks.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ritanuwo.epizy.com/pogawovonifinafo.pdfIn PDF document text
    • http://vulaxojanomu.rf.gd/tketici_cayma_hakk_formu.pdfIn PDF document text
    • http://fudogupadi.rf.gd/pizapamebopukafikubazi.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_off0000d3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B7 5376 bytes
SHA-256: 0cd28c6df7d90f9b9bea5dadd7d12a4de314a816dd0b564845e0a107b4c95740
font_01_sfnt_off0000e616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE616 10096 bytes
SHA-256: c9ad754753414aa834c4543072a14002e95481a015b1290d14e2c7affd1617cf

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