Malicious PDF — malware analysis report

Static analysis result for SHA-256 284bb562c9ef6755…

MALICIOUS

PDF

78.1 KB Created: 2021-03-11 18:32:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 86f7e0db96194c11745f3e747f1fff10 SHA-1: 4f77dafb9f05e0c214f8a9fa070790e5f96ee3fc SHA-256: 284bb562c9ef6755c349e1eee63219962ad28b3a4b4a688e83f4801c820a565d
186 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, suggesting a link farm or SEO spamming operation. The primary URL, 'https://dugedepap.ru/award?keyword=effects+of+cyberbullying+on+students+pdf', is presented as a search result to lure users. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its deceptive content and link farm characteristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=effects+of+cyberbullying+on+students+pdf PDF link annotation
    • https://wefidabewurar.weebly.com/uploads/1/3/1/1/131164485/guvalifudebowu-fuxedesurulabod-tesibawe-feguf.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/hcniggj/cannonball_record_broken_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/digiwejasipu/iddqkyy/phoenix_arizona_population_rank.pdfIn PDF document text
    • https://vunakeba.weebly.com/uploads/1/3/4/6/134623580/6839765.pdfIn PDF document text
    • https://cdn.sqhk.co/gozolosew/Wiab6Rl/national_geographic_subscription_deals_uk.pdfIn PDF document text
    • https://zawuziwoju.weebly.com/uploads/1/3/1/6/131636930/b97d12ab9bcc2.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/5630feb0-2683-4314-8960-deaa087f01c3/policy_paradox_the_art_of_political_decision_making_third_edition.pdfIn PDF document text
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_3aa8ccff5ece43a7af3f1f7f17d87799.pdf?index=trueIn PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_c0ce403c22544b1495799ecc831109c5.pdf?index=trueIn PDF document text
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_5de7d1b28d574810ab60efc73907273e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/guvovigo/how_much_does_honda_a12_service_cost.pdfIn PDF document text
    • https://aee666f7-65d2-4416-8089-42e5bd85255d.filesusr.com/ugd/c4036c_792215dfff0a4226abfeddba6bcad0d4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/jomokovolorupufalewizu.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/album_songs_free_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4da06a3-871e-4c57-9d60-1f22e54d240a/global_astrology_predictions_2021.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/days_of_the_week_worksheet_for_kindergarden.pdfIn PDF document text
    • https://19a39513-20cc-49d1-a75c-e30ce0314142.filesusr.com/ugd/f99735_f89a073ec68e44e791e105b640b83889.pdf?index=trueIn PDF document text
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_37afa765f60b45688e608fef8676841e.pdf?index=trueIn PDF document text
    • https://73856814-13bb-4d44-aeaf-752cce6ba6bd.filesusr.com/ugd/a0d21a_6056457d8ab44565a26cec890483ef39.pdf?index=trueIn PDF document text
    • https://c370dac7-4848-4fa0-a6df-94361299e8ba.filesusr.com/ugd/fa6303_1fbf9910f9fb4f31aba54021ffff23b2.pdf?index=trueIn PDF document text
    • https://5c817321-7c0c-448b-959d-deb1da9fd788.filesusr.com/ugd/19103d_aceccb5752904445bd87b675906b304c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/negonanopix/best_enzymatic_cleaner_for_pet_urine.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_off0000f8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B7 5312 bytes
SHA-256: 5605f96b3d9039867d23ced4a3b4f47731d124a13791d85eaf3aa9f7a18a3b3c
font_01_sfnt_off00010ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE3 9408 bytes
SHA-256: e44ccd0b9e5250c54f829583945a1066c473e93f775564f9b993e2f408c1a7b5