Malicious PDF — malware analysis report

Static analysis result for SHA-256 305c7f3f644d262a…

MALICIOUS

PDF

79.4 KB Created: 2021-02-14 05:43:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: b3c61a45e141c8e465a53f2513d3fccc SHA-1: 07a3a10e1d7daa3026f2d98615d4c4a4b7e194d8 SHA-256: 305c7f3f644d262a3f59e670222436fbffc9f14dd5b26e391f084457fd4221da
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to various PDF files hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The primary function appears to be redirecting users to other potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/wix?keyword=maplesaga+hero+guide PDF link annotation
    • https://tezilejesitox.weebly.com/uploads/1/3/1/1/131163634/4373704.pdfIn PDF document text
    • https://xalitizamer.weebly.com/uploads/1/3/4/8/134863297/guzewukusu.pdfIn PDF document text
    • https://marikiwow.weebly.com/uploads/1/3/1/3/131379510/bezowonosegosir.pdfIn PDF document text
    • https://cdn.sqhk.co/mitejapeki/dgeibij/oneplus_7t_round_icon_pack.pdfIn PDF document text
    • https://cdn.sqhk.co/xetokive/ojdgjmU/grail_knight_challenges.pdfIn PDF document text
    • https://cdn.sqhk.co/sojowidaz/cFPjhra/dufasur.pdfIn PDF document text
    • https://cdn.sqhk.co/retobumoki/tREgfif/18711875672.pdfIn PDF document text
    • https://vogoworelo.weebly.com/uploads/1/3/4/2/134266182/rejifaf-rofezugepugojim.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/Khidje9/download_free_ringtones_for_your_mobile_phone_zedge.pdfIn PDF document text
    • https://cdn.sqhk.co/bamikalagov/cgeiihg/sijuxetinejape.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/jaCicij/hocus_pocus_shirt_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/0Aiaggc/soramemexapipixoke.pdfIn PDF document text
    • https://cdn.sqhk.co/perajomipe/jd3jjgi/simpleplanes_flight_simulator.pdfIn PDF document text
    • https://vaxidavuk.weebly.com/uploads/1/3/4/3/134371973/7d6d473eb590d7.pdfIn PDF document text
    • https://cdn.sqhk.co/segenapiza/Nhh8jbS/microsoft_365_need_admin_approval.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450734/normal_60161ce1c6e0f.pdfIn PDF document text
    • https://panusefebile.weebly.com/uploads/1/3/5/3/135331690/gazedegiledup.pdfIn PDF document text
    • https://cdn.sqhk.co/dufikibagi/opLRjjI/one_talk_mobile_client.pdfIn PDF document text
    • https://cdn.sqhk.co/wofetewa/dnhlJji/meme_hub_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459796/normal_5fca5e342fbef.pdfIn PDF document text
    • https://cdn.sqhk.co/sosobita/hiq4geC/86519180901.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF705 5228 bytes
SHA-256: adc7c6c0b1e90d8ad9fe8d926110bd82504d7df46edd8dda4e39a525b4259970
font_01_sfnt_off000108d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D0 11972 bytes
SHA-256: 2d34397de2ad2f718869769e42203b206209aa7fceea1d7bd78a704bb96f370d

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