Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1b81470c58295c…

MALICIOUS

PDF

69.4 KB Created: 2021-02-27 15:21:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 3c58610c0d32f18c77835c49e8880581 SHA-1: 5b21225dda5d28720243a6e1e53ab8c36b2b8ac9 SHA-256: bc1b81470c58295cf600161e6729b08f8a56d3e4bc8fbac899f54eeb883de19b
244 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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/award?keyword=how+to+check+for+serial+number In PDF document text
    • https://pudodogefelareb.weebly.com/uploads/1/3/1/6/131606347/nixobunagolupatonan.pdfIn PDF document text
    • https://cdn.sqhk.co/gidenateg/oZwhghd/subway_surfers_score_hack_apk.pdfIn PDF document text
    • https://xuxuratedagofat.weebly.com/uploads/1/3/4/6/134644764/watabig.pdfIn PDF document text
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/9168150.pdfIn PDF document text
    • http://sellforce.ru/rally_car_crashes_into_tractorkd9iv.pdfIn PDF document text
    • https://dutumeparozawa.weebly.com/uploads/1/3/1/1/131163590/lavilox.pdfIn PDF document text
    • https://linebabeta.weebly.com/uploads/1/3/5/3/135317009/ef816b.pdfIn PDF document text
    • https://cdn.sqhk.co/zovitamojim/shb3cHm/maps_for_mcpe_ios.pdfIn PDF document text
    • https://woxoxuwavi.weebly.com/uploads/1/3/4/6/134689382/gosevuket.pdfIn PDF document text
    • https://cdn.sqhk.co/guledijuxi/Nif2jbU/80767666744.pdfIn PDF document text
    • http://ita-bio.space/how_do_i_change_the_ringtone_on_my_panasonic_cordless_phoneffp8k.pdfIn PDF document text
    • https://dumosube.weebly.com/uploads/1/3/1/1/131163669/vozosaravukiro.pdfIn PDF document text
    • https://wiguvizokon.weebly.com/uploads/1/3/0/7/130776253/puwuwufapuw-dijaxamixero-lazopibajiv.pdfIn PDF document text
    • https://gimiduti.weebly.com/uploads/1/3/4/7/134711596/gonewejizates-koxokeladux.pdfIn PDF document text
    • http://shortsomfj.space/62994305555gn9j4.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/sirilagewuga/best_romance_movies_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/3367423894.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/eu4_guide_to_colonization.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_off0000d34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34A 5376 bytes
SHA-256: 30853784cd1315a91c88a1c6df3b26af9ea38fa754b4484013b435ea66596ff6
font_01_sfnt_off0000e57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57D 10208 bytes
SHA-256: b31ddf0a54eee6682c1e525cb4afc6024b7f81cae0d0dfa7266d947072da6423

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