Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e1257921b1eb3fd…

MALICIOUS

PDF

141.8 KB Created: 2021-05-14 15:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 99b89e66f28fed5485cd3accb1a0aa56 SHA-1: 801f63b5b4c0f7d781e87b8f0ee332084c8f65b0 SHA-256: 7e1257921b1eb3fda90a3ffe9e751537d7d4f3b35260f88d43b62ae9ef99f955
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baarspo.ru/strik?utm_term=anet+a8+install+mosfet PDF link annotation
    • https://cdn.sqhk.co/samofetob/ejgvsjc/12777226873.pdfIn PDF document text
    • https://cdn.sqhk.co/solalokazili/gijbTgj/the_trial_of_the_chicago_7_netflix_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/joxesinejag/jczLojj/neon_tube_driver_circuit.pdfIn PDF document text
    • https://cdn.sqhk.co/rolidazi/qifgcie/78063785911.pdfIn PDF document text
    • http://vaxiliwu.medianewsonline.com/jomikevefipibakexi.pdfIn PDF document text
    • https://fojaxusulilunud.weebly.com/uploads/1/3/1/3/131381134/vogikax.pdfIn PDF document text
    • https://gexasibe.weebly.com/uploads/1/3/5/3/135306593/9611166.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/fjevUgg/91580297182.pdfIn PDF document text
    • https://widosogepe.weebly.com/uploads/1/3/3/9/133986955/gezemu.pdfIn PDF document text
    • https://pobufulali.weebly.com/uploads/1/3/4/4/134494274/kulefulotefe.pdfIn PDF document text
    • https://cdn.sqhk.co/fosulavale/haUbihy/56767043449.pdfIn PDF document text
    • https://cdn.sqhk.co/bujugasefoli/ia2geLy/velerowizubutewapitibo.pdfIn PDF document text
    • https://cdn.sqhk.co/zuzememub/ig4hg7O/zekutunofir.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/kZbhbhc/90540711674.pdfIn PDF document text
    • https://cdn.sqhk.co/nedabuke/cjiqghv/coalition_multiplayer_fps_pc_games.pdfIn PDF document text
    • https://cdn.sqhk.co/jukowejazus/gjesiff/retufadufubewadamitavupi.pdfIn PDF document text
    • https://mamifonor.weebly.com/uploads/1/3/1/1/131163935/dac1b.pdfIn PDF document text
    • https://dufanidozit.weebly.com/uploads/1/3/4/7/134764520/jufefe.pdfIn PDF document text
    • https://cdn.sqhk.co/wosepimi/igfIRON/40916789000.pdfIn PDF document text
    • https://cdn.sqhk.co/runenuti/hicjdS6/youtube_video_download.pdfIn PDF document text
    • http://mikovil.mywebcommunity.org/deep_learning_adaptive_computation_and_machine_learning_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sutexuvidag.myartsonline.com/bible_verses_related_serenity_prayer.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_off0001eba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EBA2 5000 bytes
SHA-256: 5fcc07f04bbcf47f624ff51e74abfcd04e3027df99ff14c14a68450d916ed7cd
font_01_sfnt_off0001fc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FC94 13484 bytes
SHA-256: 051255f661cb610301b30f003e49310b9252a1320dd94aff30bc070b349efadb