Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b475b2a3ad42f1f…

MALICIOUS

PDF

84.7 KB Created: 2021-03-22 19:26:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76bf1b765321bc4e3629b323e428ebca SHA-1: 2a6a32ecc207144b15a08463435dc671759bf737 SHA-256: 1b475b2a3ad42f1f2d9109fda920f102c8b558b0a893f29801675e36c5256297
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a large number of external links, including a suspicious URL. The document body, though heavily obfuscated, contains keywords related to a D&D character sheet, suggesting a lure. The primary malicious indicator is the external URI pointing to 'jumiwimov.ru', which is likely used to host or redirect to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/award?keyword=d+d+5th+edition+character+sheet+fillable+pdf
    • https://static.s123-cdn-static.com/uploads/4474992/normal_5fca4ab44d7d3.pdf
    • http://de-bewertung-id2842384.icu/pamokepelurazixip7f9vt.pdf
    • https://cdn-cms.f-static.net/uploads/4446924/normal_6036b4dbd50f6.pdf
    • http://tosety.xyz/kofazukavobimotunigijewofq8au8.pdf
    • https://cdn-cms.f-static.net/uploads/4481831/normal_604ccb8b08700.pdf
    • http://bigmagazin.xyz/calculus_1_practice_exam_with_answerssvg1g.pdf
    • https://static.s123-cdn-static.com/uploads/4377912/normal_6002e0f28c26f.pdf
    • http://easterthjg.com/steroids_injection_for_tennis_elbowsu2tu.pdf
    • http://epipog.com/what_is_the_major_difference_between_zenmap_and_nessus2ozuc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/dbdd633a-722f-4931-ae3a-308ac85e55f3/gijedulizafazepobamuziwi.pdf
    • https://uploads.strikinglycdn.com/files/0f7e258c-0b50-4c1c-bcad-e1e7910145a9/18935260447.pdf
    • https://uploads.strikinglycdn.com/files/51b9c501-c519-4cbc-b6a3-9005ed67f155/how_to_train_your_dragon_homecoming_2020.pdf
    • https://s3.amazonaws.com/neviwove/workday_excel_sheet.pdf
    • https://uploads.strikinglycdn.com/files/fbd15105-5919-4922-add9-5e7781377b6f/seiko_chronograph_100m_watch_price_in_bangladesh.pdf
    • https://uploads.strikinglycdn.com/files/6a036716-363f-4963-813f-f0dde329ce02/damisasidogemo.pdf
    • https://s3.amazonaws.com/solonebosop/pajebilazataranemovuv.pdf
    • https://s3.amazonaws.com/nuxomigo/65311609273.pdf
    • https://uploads.strikinglycdn.com/files/16b119a5-9495-43e4-8aa5-7e7476e92be0/12893936249.pdf
    • https://s3.amazonaws.com/sevoga/59049638220.pdf
    • https://uploads.strikinglycdn.com/files/b608526f-8547-4bc0-aa4a-d6681f02d431/zizep.pdf
    • https://uploads.strikinglycdn.com/files/077d5050-7dd1-49e4-a7db-e367052fad60/2012_jeep_grand_cherokee_overland_summit_problems.pdf
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_93d3605f6b6d4778b68f8d2a82d573e2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c735f083-2aec-41a7-b8ab-a988b87cbac0/best_buy_coupons_beats_by_dre.pdf
    • https://uploads.strikinglycdn.com/files/a61698e3-6f07-4201-81c1-3c9c3dc22748/what_are_stock_market_hours_for_christmas_eve.pdf
    • https://ad177677-9664-42cd-9bf2-17a10eef6e1d.filesusr.com/ugd/f8915e_6f123dadc5e3426681d13809f0ba6429.pdf?index=true
    • https://s3.amazonaws.com/pazovugal/vuximudufegodofujexolulaw.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cd5.bin
e2954dd7d07514a8473d47a2dfc536eaf1052b3eb73e73fdb8c87c541e164d61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD5 5504 bytes
font_01_sfnt_off00011f89.bin
dfcfe37b8f143f4038a8f23af1a33e7e5702493071c6390ea33eb59641410c0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F89 11016 bytes

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