Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ef72f476ab9310…

MALICIOUS

PDF

90.1 KB Created: 2021-04-02 08:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f0f651524f124a9946219d16822833a4 SHA-1: c3527799a3151889fc0509affae99fd18f14acc9 SHA-256: d4ef72f476ab9310feb49481cf19d8694cf48130c8eebca05747b52745abb982
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a significant number of external links, suggesting it functions as a link farm. The presence of a 'utm_term' parameter in one of the URLs points towards potential tracking or phishing activities. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://dugedepap.ru/strik?utm_term=htc+one+mini+screen+replacement PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473642/normal_60501f627ad6c.pdfIn PDF document text
    • https://cdn.sqhk.co/gijimexuv/fo0gggd/century_arms_vska_review_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/lokiwejawe/ifAhjha/gezemutixafarodun.pdfIn PDF document text
    • https://cdn.sqhk.co/xibidodoko/jbhbhaH/fuel_rewards_halloween_offer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426822/normal_5fda53a42d421.pdfIn PDF document text
    • https://cdn.sqhk.co/fakomuse/djaihjd/tuvavi.pdfIn PDF document text
    • https://manonerotorupu.weebly.com/uploads/1/3/4/6/134683358/jogabalobom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384145/normal_5fe3e97d17888.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447108/normal_6054792845ea2.pdfIn PDF document text
    • https://cdn.sqhk.co/busumodofu/enoathg/ultimate_epic_battle_simulator_no_steam.pdfIn PDF document text
    • https://sekilulijafos.weebly.com/uploads/1/3/1/4/131438177/4134431.pdfIn PDF document text
    • https://gidapozu.weebly.com/uploads/1/3/1/3/131379371/4489642.pdfIn PDF document text
    • https://cdn.sqhk.co/midijanere/BgdjfaT/primary_and_secondary_sources_worksheet_grade_6.pdfIn PDF document text
    • https://fumewalifo.weebly.com/uploads/1/3/4/8/134884483/4443398.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/zovokegukuso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464996/normal_5fd83e3100790.pdfIn PDF document text
    • https://cdn.sqhk.co/raxulaxesob/jdzFohi/75162038273.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/4e2c25f0-6123-4f53-91e1-37c23c23f44c/les_miserables_violin_sheet_music_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b998f1b7-9159-434e-a5ed-e4a26062be69/what_is_the_setting_in_the_veldt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9c4d551-b7ba-4cc6-b814-1cf9afb469a9/the_boy_in_striped_pajamas_movie_watch_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff3e4dcd-0253-46d8-b334-e89c47e49005/89199359665.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d40718d5-4746-49fa-bf55-670a27df1cd2/is_there_a_season_2_of_epix_war_of_the_worlds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36eec687-926d-4056-a541-0f1afecd170c/rizikigejar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76fc2d5b-9e32-465c-bbf6-662e43aeacfa/58577684629.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_off00012295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12295 5040 bytes
SHA-256: 8b2bc7c031c31decbb91fcd63c00ea4d2be13cafed9346bc7c21eeb294d4a81c
font_01_sfnt_off0001339e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1339E 11480 bytes
SHA-256: 84577ffc49ee18f4b51f46570f213aab1c49da2efcd7730983eb67c28ab8524e

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