Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf2c3a5b80c5c04…

MALICIOUS

PDF

97.6 KB Created: 2021-05-03 03:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 34ec6c91cea7b674497f529bd659173a SHA-1: cdf296d111e5bf3c5f35651ffaa6e3058e3f3100 SHA-256: aaf2c3a5b80c5c049b8f0906fc29c22fc2c3960fd53b79fc6d9bb96bece34c68
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://jumiwimov.ru/strik?utm_term=very+short+story+on+true+friendship+in+hindi PDF link annotation
    • https://cdn.sqhk.co/xixujipum/idhawii/boohoo_returns_policy.pdfIn PDF document text
    • https://cdn.sqhk.co/kelifevaz/f3FQgji/24859395437.pdfIn PDF document text
    • https://nigafabap.weebly.com/uploads/1/3/4/3/134377596/pameraguzopenibel.pdfIn PDF document text
    • http://lugabev.mygamesonline.org/the_rules_of_the_game_movie_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/senuziker/Mzjicje/word_sandwich_greek_gyros_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/kanedufopuma/fifjgej/78621502377.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/aoggKgf/60962325123.pdfIn PDF document text
    • https://mawobomogagot.weebly.com/uploads/1/3/4/1/134109187/tiwomigigixojubelox.pdfIn PDF document text
    • https://cdn.sqhk.co/bitowiso/yD0gjid/number_of_basketball_players_worldwide.pdfIn PDF document text
    • https://lewuroluloxujul.weebly.com/uploads/1/3/4/6/134678017/mafobijinurad.pdfIn PDF document text
    • https://cdn.sqhk.co/sazobenapur/gjpXEih/history_vault_app_on_firestick.pdfIn PDF document text
    • https://cdn.sqhk.co/vizebika/1CSvBmE/used_nitro_rc_cars_for_sale_cheap.pdfIn PDF document text
    • https://cdn.sqhk.co/tipekafomube/4ojhhjg/childbirth_delivery_videos_free_mp4.pdfIn PDF document text
    • https://cdn.sqhk.co/mapexuze/zPiaQjj/punenudifevejapeboke.pdfIn PDF document text
    • https://vezinamitin.weebly.com/uploads/1/3/5/9/135984824/2a9df4430f.pdfIn PDF document text
    • https://cdn.sqhk.co/resozasevej/ggKFjf5/98913153331.pdfIn PDF document text
    • https://cdn.sqhk.co/zidexamuwela/VggUuja/85253080366.pdfIn PDF document text
    • https://cdn.sqhk.co/zotofoza/hghdcut/oklahoma_unemployment_weekly_claim.pdfIn PDF document text
    • http://benaletuzulug.sportsontheweb.net/carpentry_hand_tools_list.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/50cb7b39-a7ac-44d5-8294-0f35c4e7f888/how_many_questions_are_on_the_ged_test_total.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9140328f-e78b-4e93-9723-0d75784c96de/what_is_the_average_income_of_a_household.pdfIn PDF document text
    • http://famomijis.onlinewebshop.net/xezulatadalinozez.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000133b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B0 4836 bytes
SHA-256: c201d006fd55fbaf0c7c76f6f3b19c6acfe29008bf2abbeebcbceacb4e60f11c
font_01_sfnt_off00014427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14427 11484 bytes
SHA-256: f902e1bde603562216cbb52fa077c4d216882eaf883edfcc7eb16eb7853789e8
font_02_sfnt_off00016aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AAE 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361