Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aa3e9058d5afdc1…

MALICIOUS

PDF

79.6 KB Created: 2021-03-22 09:49:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d0148ab7e0d8e77b8900d9a78d9ee432 SHA-1: d14a4cf8705b997afa5d88d58163463058c175ce SHA-256: 8aa3e9058d5afdc1bd4d021cef1d850cf35909a7c762cac83b540c5514ae2956
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, appears to be a lure related to poetry, intended to mask the malicious redirection to URLs like https://mezovuduw.ru/strik. This suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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 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://mezovuduw.ru/strik?utm_term=how+do+i+love+thee+poem+rhyme+scheme PDF link annotation
    • http://site-shop.xyz/best_light_novels_to_read_wuxiayivyo.pdfIn PDF document text
    • http://nefozufovi.scienceontheweb.net/5_types_of_claims_in_argumentative_essay.pdfIn PDF document text
    • https://cdn.sqhk.co/lonuxogugexi/sigse2x/dobileti.pdfIn PDF document text
    • https://cdn.sqhk.co/tedatekalo/5qjjjgg/lezozinosazapasudojok.pdfIn PDF document text
    • https://cdn.sqhk.co/dowusutitozi/h1tV8gf/stack_colors_free_online.pdfIn PDF document text
    • http://pedron.fun/partes_que_lleva_una_revista_informativay4hd1.pdfIn PDF document text
    • https://cdn.sqhk.co/senuziker/gdhe58s/metal_ball_obstacle_course_game.pdfIn PDF document text
    • http://itclick.pro/get_covered_illinois_2017_formlfsl5.pdfIn PDF document text
    • http://prazdnikprosto.ru/traditional_baybayin_fontsjp1w.pdfIn PDF document text
    • https://cdn.sqhk.co/sagitusat/IieaYhc/xikatokunowawomadifedewe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://konevimojo.epizy.com/xekejoja.pdfIn PDF document text
    • https://f87ce62f-3d5d-4c42-bff3-2e7d00444551.filesusr.com/ugd/72ed28_b2911450e71d42808d85c192087a3cdd.pdf?index=trueIn PDF document text
    • https://d5aacb37-8766-4234-9cc8-c2ec3b911aba.filesusr.com/ugd/1e723b_5e7ae654447e48a8b29b8338f0a26dfb.pdf?index=trueIn PDF document text
    • http://fekofenuxekit.rf.gd/63811061572.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/addition_math_sheets_for_first_grade.pdfIn PDF document text
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_15898e196aad41a08ac9f3c5a9329f05.pdf?index=trueIn PDF document text
    • http://gosaduzunake.myartsonline.com/wii_console_newegg.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/aurora_teagarden_mysteries.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/38916149426.pdfIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_777c998840e54a01a71e8a766c10cf59.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wezukep/funchal_cruise_port_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/biblia_griega_en_espaol.pdfIn PDF document text
    • https://167c2301-eccc-4e3a-a609-38a4f17b9bf8.filesusr.com/ugd/b1dabf_ad8aaf65044d4ab596d2fef66cd9c5f5.pdf?index=trueIn 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_off0000f7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CE 5316 bytes
SHA-256: 05d4fdc8059275f94e78e1af9857499ce28034cd09322a988ead2bbd7a3f1308
font_01_sfnt_off000109d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D7 11172 bytes
SHA-256: a9bc4c3904588d07ebdc9cfa137876562d784740402bffd570f5d810ae82e493

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