Malicious PDF — malware analysis report

Static analysis result for SHA-256 46ea269b5f94b50f…

MALICIOUS

PDF

70.6 KB Created: 2021-04-26 06:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e330eb2051f6f5b8c566bda1e6b2078a SHA-1: 135f43b816aa4231c6b3fc8e9b01be81aad0ba22 SHA-256: 46ea269b5f94b50f3e6c9e162aa770e6aeed20702b73cb3772769e2a4b6f9c37
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains or link farms, indicating a phishing or traffic-driving campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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-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://kuzutuzo.ru/strik?utm_term=coach+quinn+leather+satchel
    • http://erethiztzj.space/85745453822om46y.pdf
    • https://zowarokatovo.weebly.com/uploads/1/3/4/4/134491000/nosonu-samuvevizuk.pdf
    • http://promooffer.site/the_maze_runner_movies_listggros.pdf
    • https://pilitopamazi.weebly.com/uploads/1/3/4/3/134313639/1048339.pdf
    • https://wipasajumavadus.weebly.com/uploads/1/3/4/7/134775966/989da.pdf
    • http://marketitaly.pro/how_to_link_dish_hopperixdvl.pdf
    • https://guxitubekin.weebly.com/uploads/1/3/4/2/134267073/fovesorevaveraluxe.pdf
    • https://famimiketavow.weebly.com/uploads/1/3/0/8/130873946/549e64a.pdf
    • http://aycotoro7.xyz/playstation_store_gift_card_gamestopapnzd.pdf
    • http://atelier-spb.com/kuwomojalowezusadalu2pto4.pdf
    • http://cenderaoriginator.com/vcenter_6._0u3yx28g.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_5b76e5347b554af2b46e2f71a6ddee10.pdf?index=true
    • https://s3.amazonaws.com/kiguteperilodu/1700065494.pdf
    • https://s3.amazonaws.com/vitelitubovuluj/vuparo.pdf
    • https://s3.amazonaws.com/zazelujeju/vikiso.pdf
    • https://b8e64ff8-a522-4625-8e91-70fe47930cb2.filesusr.com/ugd/37987b_58e2fea042484642b88750f80a9e6b3d.pdf?index=true
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_57712eba41b84e5781a6b8823cf0ea0a.pdf?index=true
    • https://fd0ef26f-7b8f-4c91-b3b2-19f7ec93487a.filesusr.com/ugd/4174bf_3f6e97d7188f4fc29500d515e64ee57d.pdf?index=true
    • https://s3.amazonaws.com/jolunenafobuw/refomuvewaxawufidesagaxo.pdf
    • https://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_d0fdac9604cb4211a92e3cde55745fb9.pdf?index=true
    • 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_off0000d4b1.bin
a3231bdc5dbe1dfcfd144471f3f0cd9e9da375cfad3e76c1f551ab14957f43b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B1 4920 bytes
font_01_sfnt_off0000e562.bin
d83847a33fcf92340b1079354f7295ea736fd1fe01402aa8487ccff3e7122f8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE562 11336 bytes

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