Malicious PDF — malware analysis report

Static analysis result for SHA-256 8166b8d393a46a22…

MALICIOUS

PDF

103.5 KB Created: 2021-04-12 16:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2f356b2192360db7f201edf99dd909b1 SHA-1: c51e9af9117a6d31230dccd4810305960387a08d SHA-256: 8166b8d393a46a22b2366cd6d8b3066c3a98caad508ebb685f972b1d3cc3b55b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary suspicious URL identified as https://mezovuduw.ru/strik. Heuristics indicate this PDF is a link farm on disposable hosting, and ClamAV detected it as Pdf.Phishing.Trojan. The ML classifier also flagged it as malicious with high confidence. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://mezovuduw.ru/strik?utm_term=the+power+of+now+author+eckhart+tolle PDF link annotation
    • https://cdn.sqhk.co/nexoratuxi/ejcsMgf/among_us_costumes_diy_cardboard.pdfIn PDF document text
    • http://shoop-fk.ru/bhootnath_song_video4enu6.pdfIn PDF document text
    • https://cdn.sqhk.co/fogibadeku/bjbigtC/20717384782.pdfIn PDF document text
    • http://sentytld.online/giwobokozuvijizumejevetej693jy.pdfIn PDF document text
    • http://teplotronic.ru/acordes_de_guitarra_sostenidos_y_bemolesu7396.pdfIn PDF document text
    • https://cdn.sqhk.co/bomoxale/cyhdieL/halloween_maze_printable_easy.pdfIn PDF document text
    • http://winoorama.fun/blue_cheese_dip_nutritional_informationm4ch0.pdfIn PDF document text
    • https://cdn.sqhk.co/sowanigog/cWgdSGA/33542368461.pdfIn PDF document text
    • http://xsale.trade/rapazotuluzivonefidifixedrnlpu.pdfIn PDF document text
    • http://rankingcoach-seo.com/loxufibedoropebisij0vsug.pdfIn PDF document text
    • http://7evenrp.ru/60861193393me577.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/9b99968e-74fd-44a7-a0b1-3775d3bbd3df/what_is_social_construction_of_gender.pdfIn PDF document text
    • https://9abff256-b119-4e75-a612-dfc075f5428e.filesusr.com/ugd/c73517_79deff6a17d0425985bd0d4dda31059f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4223bb98-31e7-4114-b07d-ab3d0c1c9407/saraswati_puja_mantra_in_bengali_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3a190a9-30fa-42b3-b8bb-9842aa426c63/odd_thomas_movie_ending.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/85879061575.pdfIn PDF document text
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_2c50efd0f72e49089b632b5ad5ed2acf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2076dc2e-489a-4715-8fd9-f5cf45bbfd05/bekexesajazumanux.pdfIn PDF document text
    • https://907864b8-ab38-4b43-b195-7646ee37c451.filesusr.com/ugd/c4b402_b0b613844f2946418cfd83eff42586fa.pdf?index=trueIn PDF document text
    • https://1ceef7f3-d523-4f80-a0a4-3aed54d3d17a.filesusr.com/ugd/48841a_b97363b299a04ba5b5f3ae1e0fc9a9f0.pdf?index=trueIn PDF document text
    • https://933afb0c-60ca-4ff4-ba38-e7c804ca925d.filesusr.com/ugd/941881_5dc025608d23493c948b8275a8c5e89e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/29891b3a-0bc4-4940-8046-9e47bec11107/how_is_serena_joy_presented_in_the_handmaids_tale.pdfIn PDF document text
    • https://s3.amazonaws.com/kovibu/20051740653.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_off0001599e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1599E 5028 bytes
SHA-256: 1e0b7e1c01ad50b83fddd2ef1b22daa26d3721a2c396843bdac9e653576a57a9
font_01_sfnt_off00016ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AC5 11312 bytes
SHA-256: fd34d1ac3ca4e2ebf4aae45b08328f58b646cb19b893eae2b682fbbcc8f5e310