Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6e4814dd8a37dec…

MALICIOUS

PDF

92.3 KB Created: 2021-04-08 18:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f6911678372fc5d99a41572a6b215c6f SHA-1: d61177a9c4ad4a291a9e6c503ebbc34df1a71bcd SHA-256: c6e4814dd8a37dec0e370c6517a0cea389836d7586bb1d72af5a0a86d1cd77bd
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links pointing to disposable domains, a common tactic for SEO link farms or distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern observed is the creation of a link farm designed to mislead users or search engines, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/strik?utm_term=types+of+bonds+practice+worksheet PDF link annotation
    • http://lnstagram-verifedbadge.com/what_is_child_centred_approacheg5tr.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzowadijavu/fmjj3gi/download_block_gun_3d_ghost_ops.pdfIn PDF document text
    • http://rastet-malysh.ru/businessman_movie_songs_in_tamil710f6.pdfIn PDF document text
    • http://meine-gebuhrenfrei.com/devilbiss_pro_air_5hp_20_gallon_air_compressor_manual0zwto.pdfIn PDF document text
    • https://danodukuwen.weebly.com/uploads/1/3/1/6/131637043/pajuto.pdfIn PDF document text
    • https://cdn.sqhk.co/foroboreb/gcudhhS/red_blue_gold_balloon_garland.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474719/normal_5fee67bcef2d4.pdfIn PDF document text
    • https://cdn.sqhk.co/tobijoge/9gebWnu/sonic_boom_tv_show_all_episodes.pdfIn PDF document text
    • https://polisurev.weebly.com/uploads/1/3/0/7/130740145/6624298.pdfIn PDF document text
    • https://cdn.sqhk.co/motuwezelu/1gffgfO/helix_dream_catcher.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470231/normal_603047ba728d2.pdfIn PDF document text
    • http://copyrightproblem.com/pizukatimejelefidinozynum9.pdfIn PDF document text
    • https://cdn.sqhk.co/tabewinudeka/bggxKTf/sebepifuxuzesemiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382193/normal_605dcd517a1b1.pdfIn PDF document text
    • https://vesodebeso.weebly.com/uploads/1/3/4/3/134314426/850279fb.pdfIn PDF document text
    • https://cdn.sqhk.co/noxibogalu/s25Wjao/ludovico_einaudi_night_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/bomumuxa/djdICVc/gavofugigagov.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzudulo/fiLjhgd/ballinger_commons_apartments_shoreline_wa.pdfIn PDF document text
    • https://cdn.sqhk.co/gikiwifada/fmkjjhg/barbie_cake_images.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/jicYlTn/42713987864.pdfIn PDF document text
    • http://com-connexion.xyz/pet_sematary_1989_full_movie_in_hindi_480pj4u9x.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_off000129ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AC 5560 bytes
SHA-256: a4b67408c90f28343c8d15494239f72deed1ec29e2db6478c01cd12a458ab26a
font_01_sfnt_off00013ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA2 11624 bytes
SHA-256: f9a70ead9ff7386c26d53f90d93d151a77c0f9908bde1c9a289e19a3cf3030e3

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