Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c3a81d4872f4553…

MALICIOUS

PDF

76.2 KB Created: 2021-04-12 13:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 66117dd8c6b66781ee6d700b058203e2 SHA-1: 67559448da4a4464d6e32b68932d8b93cffd0abe SHA-256: 1c3a81d4872f455312d9839a6ec65464c236f654f2ceb222399d863269410331
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with the primary URL pointing to a suspicious domain. ClamAV detected this as a phishing trojan. The presence of embedded URLs and the heuristic firing for PDF_SEO_LINK_FARM indicate a malicious intent to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=lord+of+the+flies+chapter+7+comprehension+questions+answers PDF link annotation
    • https://cdn.sqhk.co/wixexozesila/bX6ijhI/9479218648.pdfIn PDF document text
    • https://kejobogufepemis.weebly.com/uploads/1/3/0/7/130775396/8d8103.pdfIn PDF document text
    • https://cdn.sqhk.co/xeposetuge/gLjaRhi/snapseed_photo_editing_tutorial.pdfIn PDF document text
    • https://rewojomivatal.weebly.com/uploads/1/3/5/3/135345623/601c1ff1be544de.pdfIn PDF document text
    • https://cdn.sqhk.co/gixejefi/gYBpigv/clover_dating_app_reviews.pdfIn PDF document text
    • https://zudomizat.weebly.com/uploads/1/3/5/3/135308615/kukaxemaretipa.pdfIn PDF document text
    • https://cdn.sqhk.co/kexofodatop/Fgcjjib/track_phone_number_location_free_app.pdfIn PDF document text
    • https://cdn.sqhk.co/zibavuna/ftPCZaQ/animal_roadkill_statistics.pdfIn PDF document text
    • https://cdn.sqhk.co/kuvuzebilet/esNehTu/27108169854.pdfIn PDF document text
    • https://cdn.sqhk.co/bepeguvovori/ffqifhe/lezusevadokuvodufizefa.pdfIn PDF document text
    • https://bejogagufuse.weebly.com/uploads/1/3/4/3/134385068/8503389.pdfIn PDF document text
    • https://cdn.sqhk.co/kokedipemi/heShhgc/free_2nd_grade_math_learning_games.pdfIn PDF document text
    • https://bidilupaduwin.weebly.com/uploads/1/3/4/4/134464246/gatojujaf-jobanububer.pdfIn PDF document text
    • https://cdn.sqhk.co/jukunobegabe/hcghhgI/printable_reward_chart_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/bivuwusim/gdWieit/vibijavoxipoziwomawam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2cdd190-b2f0-48db-bf3e-b4aa2d0215d6/which_pressure_cooker_is_best.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a069d6d-37c6-42ca-9634-2f05aa2592a0/libezaxidupaxevilafatuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bff4cf5-fe67-4283-9319-8af08c609652/96731767519.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b00cc654-90d3-4cad-9a17-e734a76d8333/bose_model_av3-2-1ii_media_center_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2f52783-e7de-4f88-b333-e17f9cafd5ce/wosewaxilesuma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c61c8f6e-4341-4ec3-ba21-e3bfb3ec3ae3/how_long_will_castor_oil_last.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c38890b-1950-472c-9062-a6d70fbb8860/nukuxatabototirugeb.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5D 5632 bytes
SHA-256: 6aa1d003cdd26c186ad2f231c3c06e63e9a10ee4d26615ae5b761d29085ab4a8
font_01_sfnt_off0000fd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD79 11032 bytes
SHA-256: c87ac6a9c5111b44f3f2d3ea097a5de0072639e7429f47f167873357aa41e85e

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