Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff3e5450e9f61e7d…

MALICIOUS

PDF

78.4 KB Created: 2021-04-07 02:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 85d72105e0ba3c6d5d850e5c8cc14578 SHA-1: ea2ff5824c8e25d156a2e48dade5ec8f30eb6103 SHA-256: ff3e5450e9f61e7db6c8a13d94025a76520654509ae7c6cd280f840e2292a42c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, appears to be a lure related to a 'manual'. No scripts were extracted, but the presence of numerous external links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://xezojetit.ru/award?keyword=manual+de+codicia+brontis+jodorowsky+pdf PDF link annotation
    • https://dakogepakidi.weebly.com/uploads/1/3/5/3/135391125/gukuridubofu_bepipovusagu_sumerubugokaxa.pdfIn PDF document text
    • https://rajepejejema.weebly.com/uploads/1/3/4/8/134860913/7c91e4121543.pdfIn PDF document text
    • http://opensalle.xyz/aberdare_cablesx02lb.pdfIn PDF document text
    • https://mejidoxele.weebly.com/uploads/1/3/4/3/134320803/bc0bd.pdfIn PDF document text
    • http://reduslim-official.website/2527522350i2ooe.pdfIn PDF document text
    • http://art-practice.org/nokup6430t.pdfIn PDF document text
    • http://bupro.asia/7710716878897hik.pdfIn PDF document text
    • http://select-get.top/kenwood_ddx9702s_wiring_harness29jj8.pdfIn PDF document text
    • http://thrivewebs.com/understanding_the_bouguer_anomalyxo6mj.pdfIn PDF document text
    • http://powerpoint4you.ru/free_blank_flash_card_template8dobh.pdfIn PDF document text
    • https://jitolubupiloz.weebly.com/uploads/1/3/4/6/134637312/ditak-xudirowa.pdfIn PDF document text
    • http://spainsale.pro/31774779207k0fxt.pdfIn PDF document text
    • http://santecmb-sarl.com/briggs_and_stratton_shop_manualxvqq5.pdfIn PDF document text
    • http://vehicleusains.com/seth_material_podcast6o8x5.pdfIn PDF document text
    • http://cardioactiveuficiale.site/how_to_save_bitmap_image_in_android91dhm.pdfIn PDF document text
    • http://itabody.space/badamojjoz.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/jazofi/72177283278.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/38162919013.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/42402046064.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/presto_01362_6-quart_stainless_steel_pressure_cooker_parts.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_off0000ef14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF14 5628 bytes
SHA-256: 6619910f70152f288ac853ebecd0a50b0b2ae83c7366003b9fed27b1c4c39891
font_01_sfnt_off0001026b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026B 12268 bytes
SHA-256: 04e81d56192afdcaac37edeb538ec21edec7a8229e1a39a52636bacdbbabdcd0

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