Malicious PDF — malware analysis report

Static analysis result for SHA-256 533735a29b3a32ba…

MALICIOUS

PDF

79.6 KB Created: 2021-04-15 05:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1334b5a2139ba0d09a4dfc48dac023bd SHA-1: b306bece08808ea30fcd6dc7b4336512ea52a080 SHA-256: 533735a29b3a32bab2b8e19b7d4f413ccca509797f91c4abb7f737b36322d6e3
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://dafemum.ru/strik?utm_term=my+troy+bilt+snow+blower+will+not+start PDF link annotation
    • https://cdn.sqhk.co/rodesedaded/hjiegew/easy_homemade_ice_cream_without_half_and_half.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/0gihfig/14467374852.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/uiciigL/universe_sandbox_unblocked_free.pdfIn PDF document text
    • http://copyright-infringement.business/how_to_reset_canon_ink_cartridge_after_refill02upq.pdfIn PDF document text
    • https://cdn.sqhk.co/pipujevi/dRricgd/ropizupu.pdfIn PDF document text
    • https://cdn.sqhk.co/motanunika/1bijVNu/popscene_music_industry_sim_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zimalodepafo/ijONgi3/ziwuvixibexuxumolov.pdfIn PDF document text
    • https://cdn.sqhk.co/misusulebix/G4iWjeD/fukapedibunipekuki.pdfIn PDF document text
    • http://wiinorama.fun/38262138106ylv4y.pdfIn PDF document text
    • https://cdn.sqhk.co/gumorefose/jfMBgfL/movistar_peru_celulares_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/dagozuwemep/c3NkWvI/82821247659.pdfIn PDF document text
    • https://cdn.sqhk.co/wavafinudow/0je7Mja/zudejimumudawi.pdfIn PDF document text
    • http://sale50.pro/what_does_sud_mean_on_a_whirlpool_duet_steam_washerzejfe.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/jg59Ggg/22767573364.pdfIn PDF document text
    • https://cdn.sqhk.co/nupopobax/gdsrsTY/32325269859.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuzobisu/fgNPric/star_picket_driver_for_sale.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_84730e78247d4fdfa265f3eacae4c241.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/consumer_reports_subscription_online.pdfIn PDF document text
    • https://b615eccc-4413-4b1d-8109-ede925130a83.filesusr.com/ugd/0994f9_2c3dde50708e4baea249868b1b3de991.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/poresi/what_is_the_theme_of_the_poem_red_rover_come_over.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_off0000f88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88F 5016 bytes
SHA-256: 4282dccff0812a75f0a142e44de1556f2a1c91e44a0910bf08e01087bfacdf23
font_01_sfnt_off000109cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CC 10988 bytes
SHA-256: 6b517c8f4f33a504e86206e6ce3124e9a63aa0037b297aefaf10975da62f2702

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