Malicious PDF — malware analysis report

Static analysis result for SHA-256 941c1a96878a6a27…

MALICIOUS

PDF

77.1 KB Created: 2021-03-16 22:07:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 19cf1c4ad1b7c16f7cea8dd697fd03fc SHA-1: a781e1098e91bdc5a94a18ce1c21db456d48add8 SHA-256: 941c1a96878a6a27dfb6f0367b44d5e208f96e738c4f980b396c0b7a0a5925de
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and external links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/strik?utm_term=john+deere+l120+snowblower+attachment+for+sale PDF link annotation
    • http://jusukigib.sportsontheweb.net/dominos_pizza_allergy_list.pdfIn PDF document text
    • https://nunipotewisi.weebly.com/uploads/1/3/4/8/134892443/3924177.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/49436836359.pdfIn PDF document text
    • https://buroxaserojer.weebly.com/uploads/1/3/1/0/131070485/2886782.pdfIn PDF document text
    • http://mjawebdesign.net/samsung_galaxy_s9_plus_lifeproof_fre_casexzaxc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493553/normal_6018dd44544e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461791/normal_6002c92610633.pdfIn PDF document text
    • https://wixinuwexe.weebly.com/uploads/1/3/0/7/130739185/8234833.pdfIn PDF document text
    • http://lotto-investclub.com/60980151413v6iah.pdfIn PDF document text
    • http://muzhskoizhurnal.ru/semiconductor_devices_physics_and_technology_3rd_ed._s._m._sez_wileyg99mg.pdfIn PDF document text
    • http://vurovolapoza.mygamesonline.org/zotazekinukelibigamatu.pdfIn PDF document text
    • http://cafechorsu.ru/rikoxozexugabusaxexomowei1idg.pdfIn PDF document text
    • https://xafituku.weebly.com/uploads/1/3/4/8/134863640/6ba508fe54c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365583/normal_5ff7cdeb287eb.pdfIn PDF document text
    • https://vebupanulaxufe.weebly.com/uploads/1/3/4/3/134393715/e4278f2d202.pdfIn PDF document text
    • https://pedumukelogo.weebly.com/uploads/1/3/0/9/130969284/rulosunew.pdfIn PDF document text
    • https://kusipujetaz.weebly.com/uploads/1/3/4/4/134462876/nizosoduregabikojusi.pdfIn PDF document text
    • https://letotanuvimipe.weebly.com/uploads/1/3/4/5/134598603/561b00ff1f3.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/pilazi/vupipajokejeliridomedumum.pdfIn PDF document text
    • http://pexirud.onlinewebshop.net/rod_of_seven_parts_adventure.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/knowing_brother_izone_sub_indo_full.pdfIn PDF document text
    • http://kedisijusa.onlinewebshop.net/download_samsung_xpress_m2880fw_printer.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/how_to_do_proofs_in_philosophy.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_off0000ecb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB7 5808 bytes
SHA-256: 6a2d3efeab9ee8bb4c8e6350b823517c18932bc2ca924e31d17a2f1830629ed3
font_01_sfnt_off00010065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10065 11200 bytes
SHA-256: d59340deeb507122c2ddd117785fc77a0cfd579609e2bb13d5185276ddc1b5fb

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