Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e63cac804456ca8…

MALICIOUS

PDF

103.3 KB Created: 2021-03-07 01:08:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fa743353afb1baec318f88663769f163 SHA-1: aeae51c23a944202e6c01c97379a1309f07b67ab SHA-256: 4e63cac804456ca8d42e1880a4b66ac0f2540a65506707adc779ea49e88e44db
196 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to SEO-optimized PDF files, suggesting a link farm or phishing campaign. The primary redirector URL, 'https://seumenha.ru/strik?utm_term=what+is+the+importance+of+marbury+v+madison', is a strong indicator of malicious intent. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=what+is+the+importance+of+marbury+v+madison PDF link annotation
    • http://xiravudes.22web.org/can_you_gain_muscle_with_bodyweight_training.pdfIn PDF document text
    • https://cdn.sqhk.co/lotivadafe/nUggfgj/used_drag_racing_tree_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/xolilipedeko/cUgegjW/bandpass_speaker_box.pdfIn PDF document text
    • https://cdn.sqhk.co/xodakebebit/viaXjjd/tulitanawizazij.pdfIn PDF document text
    • http://nadozigipak.22web.org/57665055006.pdfIn PDF document text
    • https://cdn.sqhk.co/zativojor/ihjedej/zombie_hunters_arena_online_game.pdfIn PDF document text
    • http://mosoxiliraf.iblogger.org/cyanogenmod_13_mirror.pdfIn PDF document text
    • http://lomuwugevona.getenjoyment.net/homeless_bird_audiobook.pdfIn PDF document text
    • http://xumupizaxuto.scienceontheweb.net/how_to_service_lg_air_conditioner.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosewude/ikkjgQs/welelikuvegunog.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/povelenavuviw/6380038275.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/rupinder_gandhi_3.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/monejurubegujupokabif.pdfIn PDF document text
    • https://f3c4034a-4a94-4c47-b6c5-0445626d7bf8.filesusr.com/ugd/655f09_b92c9b259965457ba647d2d90e863e50.pdf?index=trueIn PDF document text
    • http://dufexisoji.rf.gd/norton_antivirus_security_apk_mod.pdfIn PDF document text
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_8fe256e131b54087977eec02c086e7dc.pdf?index=trueIn PDF document text
    • http://bigobawavelig.epizy.com/70789239526.pdfIn PDF document text
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_a5309ff8197c4c80b159262c58d4d0de.pdf?index=trueIn PDF document text
    • http://nekezoxugi.rf.gd/amrit_ki_barse_badariya_bhakti_song.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/access_saskatchewan_tv_guide.pdfIn PDF document text
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_93cb315e87474e2888bf87e82cd4ea38.pdf?index=trueIn PDF document text
    • http://ropajevunowijit.epizy.com/30051277942.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/mutirupufajovovo.pdfIn PDF document text
    • http://waminakukivexo.rf.gd/kurukshetra_university_date_sheet_ba_1st_year.pdfIn PDF document text
    • https://12f7643e-9106-4823-89c2-0bdaecd1bc22.filesusr.com/ugd/1f6d71_ccdae91081d0479e9abfa22e3e8efd6d.pdf?index=trueIn PDF document text
    • http://fepobetef.rf.gd/what_are_the_best_deep_freezers.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_off00015440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15440 5680 bytes
SHA-256: 5d997336d5bc6270ea46033eb6f710c59de5b3617a94dee7885a72f19b74f2b2
font_01_sfnt_off00016774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16774 12000 bytes
SHA-256: 1145ef5599a04dd994368a328af3ef8fe1a5f87ad1a2379c73052862f1142691