Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddcf147074dcdbfe…

MALICIOUS

PDF

127.3 KB Created: 2021-03-20 16:06:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d14a7cda4a7b0e049b6ed95d885436c2 SHA-1: 7207e5d13968df6a9a7dc554348cb90b0ae63da8 SHA-256: ddcf147074dcdbfe07bc5c617d1708ef56ab374174299cbca7b8e6a62562907e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high concentration on disposable hosting and link farms, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a common phishing lure, likely leading to a second-stage download or credential harvesting site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/strik?utm_term=toefl+ibt+reading+vocabulary+pdf
    • http://wspring.space/tufatasilalf8s55.pdf
    • https://welajewovire.weebly.com/uploads/1/3/3/9/133999455/sovikusu.pdf
    • http://golixudib.mypressonline.com/62211168854.pdf
    • http://lightsex.ru/wd_tv_live_media_player4xi4m.pdf
    • http://prodson.fun/59600412125hmv7y.pdf
    • https://cdn.sqhk.co/wufotubi/jiezAfr/how_to_make_a_master_crafter_in_eso.pdf
    • https://sezalufuveded.weebly.com/uploads/1/3/4/3/134389043/dufitugazibatinu.pdf
    • https://pelimabogex.weebly.com/uploads/1/3/4/6/134685965/lokane_lilurajejip.pdf
    • https://cdn.sqhk.co/josurowelimu/gdgd3ge/5366623820.pdf
    • https://luwimaxilonava.weebly.com/uploads/1/3/4/7/134772317/damasato-kuraxedudugo-direfudenelu-xorutuwobag.pdf
    • http://chambrehub.xyz/masque_of_the_red_death_rooms8exrz.pdf
    • https://nuguserofaj.weebly.com/uploads/1/3/0/9/130969707/xagovavorijitupes.pdf
    • http://afracheat9.xyz/jodorigividoriwudilebu48k7i.pdf
    • http://gidonuvawugirid.medianewsonline.com/magic_tree_house_merlin_missions_books_1-25.pdf
    • https://cdn.sqhk.co/sidamebo/ibiiXjj/vovasopo.pdf
    • https://wudegilunukoga.weebly.com/uploads/1/3/1/3/131379548/8387435.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ddb150a6-1846-46e9-b645-2be399409b75/how_to_use_the_ti-30xa_calculator_for_exponents.pdf
    • https://uploads.strikinglycdn.com/files/4660548b-f561-4f24-a3b2-2cf93fdc405d/what_to_write_in_goals_in_performance_review.pdf
    • http://wusozupit.myartsonline.com/bopiluguro.pdf
    • https://uploads.strikinglycdn.com/files/07291002-5933-4a87-89c9-320a77f60f31/wudadizesu.pdf
    • https://uploads.strikinglycdn.com/files/fb3584ca-27d2-428f-b512-04c12b871fdd/86600580684.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_off0001b43f.bin
a50483565afaea5be3316cbf024454786d3ec17980c303cdf88436dffae4bc34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B43F 5396 bytes
font_01_sfnt_off0001c6b5.bin
3212e7c2c827ababb9e48390e3867882491eeefe57ff0662e9bc18d9cfa1797b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C6B5 12032 bytes

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