Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c3e81d7d7ea4c6…

MALICIOUS

PDF

70.8 KB Created: 2021-03-23 06:17:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5acd08fab0240604c8214207057df853 SHA-1: 2b582b0fdfd5412a4748817f93774f7debb27fe6 SHA-256: b1c3e81d7d7ea4c6a44cb4573c4158ffa8133a8025cb70de5eb363709e2ef9bb
126 Risk Score

Malware Insights

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

The PDF file contains embedded links and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a lure to a malicious URL, likely for phishing or to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://jumiwimov.ru/123?utm_term=karambit+fade+pattern+index+guide PDF link annotation
    • https://cdn.sqhk.co/xubewarow/Vgcggg1/while_true_learn_solutions.pdfIn PDF document text
    • https://cdn.sqhk.co/fajaleniwa/giicgjN/bimomoborulujidozeb.pdfIn PDF document text
    • http://newutatokulu.getenjoyment.net/1st_grade_math_worksheets_subtraction.pdfIn PDF document text
    • http://raifaisentapp.online/gevogokexefufuzitilimigar6c3ys.pdfIn PDF document text
    • http://idealslim-italiaofficial.site/heil_sp80_furnace_problemsdkld6.pdfIn PDF document text
    • https://cdn.sqhk.co/nizivatitogu/ignjglS/hello_kitty_cafe_las_vegas_yelp.pdfIn PDF document text
    • https://cdn.sqhk.co/kuxazigozo/iewghU3/best_app_to_limit_screen_time_iphone.pdfIn PDF document text
    • http://openlait.pro/what_stretches_are_good_for_flexibilitys5l1r.pdfIn PDF document text
    • http://ukranews.icu/kewerolasigakosagikevc6i7.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/sobaketemu/16308897594.pdfIn PDF document text
    • http://livirava.atwebpages.com/tagosipikubemuxovon.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/night_mother_summary_gradesaver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be6bbf64-bffa-4664-a913-4f6a3ded1eb8/1330187092.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce075aa6-5096-47ef-8ec7-a3da78bf7e48/1806611885.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cafa959-360c-46f7-9a11-cbcf70972290/the_last_wish_audiobook_vk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb316211-a1a3-471c-9148-9b8be2468236/propaganda_edward_bernays_turkce.pdfIn PDF document text
    • http://bogalibamadom.myartsonline.com/gisegifivol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ba60373-bdb5-49e8-9979-778e23eb99ab/fulatobeta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6991120e-d52e-4a82-a15b-5ebdf93b8f12/foxazitilafudusulefe.pdfIn PDF document text
    • http://madepadejatutof.onlinewebshop.net/watts_automatic_air_vent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cff047b7-0bb6-42e0-aebf-b4d95c209535/brute_lawn_mower_reviews.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_off0000d5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D3 5328 bytes
SHA-256: bd3ef8065d29c564a0484697dcb3c023ab9a8ef993e4f5ff948daabab5e1a957
font_01_sfnt_off0000e7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E6 11080 bytes
SHA-256: 7586c84a5e3a4592d67244f551bb6823e98bd7060abb5a467d424ce9868318f7

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