Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a513480acca646…

MALICIOUS

PDF

75.4 KB Created: 2021-04-07 00:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6bbe9ee588af0b05854483af0d488aa4 SHA-1: 62148cadfb141a46d854d0c0c2f56885b405e575 SHA-256: 37a513480acca646a65eec9cb1896876551b5c81ec37f0efaf1d72a0af34144a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://gimoguvi.ru/123?utm_term=latest+android+version+9.+0
    • http://se-mrush.com/dezesowum9lcyh.pdf
    • https://cdn.sqhk.co/wuzufoxo/ibhi5S8/agricultural_biochemistry_lecture_notes.pdf
    • http://fito4ka.xyz/16538991946ok487.pdf
    • http://gakawisogafuga.mygamesonline.org/93898611158.pdf
    • http://nafepuzemobir.sportsontheweb.net/nasebidigaduxivaxa.pdf
    • http://mebel-albero.ru/afterglow_headset_ps4_wirelesszcy2a.pdf
    • http://namedaun.fun/631398104037htd6.pdf
    • https://zigivigafa.weebly.com/uploads/1/3/5/3/135392575/4321621.pdf
    • http://pipvip.ru/govinda_namavali_tamil_lyricseov29.pdf
    • https://cdn.sqhk.co/wimiwupo/Rjjkhia/66296561556.pdf
    • https://cdn.sqhk.co/supekokabe/ijii3W1/71665143346.pdf
    • http://healthytrands.com/gugojuleramepuw38l.pdf
    • https://cdn.sqhk.co/luzaxatelal/rjjdjf2/indonesia_backpackers_guide.pdf
    • https://mogewojelepa.weebly.com/uploads/1/3/4/6/134681452/votoxebajuvizew.pdf
    • http://dragonflysagewellness.com/bell_hooks_all_about_lovevy4b4.pdf
    • https://cdn.sqhk.co/mixaluwekitu/hc1gjjg/forujigebasidol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wuwedilejom.myartsonline.com/what_does_guerrilla_warfare_mean_in_social_studies.pdf
    • https://uploads.strikinglycdn.com/files/ddf461f3-ea5f-4306-8c97-8f56186c47ca/metodologia_dela_investigacion_definicion_y_caracteristicas.pdf
    • https://uploads.strikinglycdn.com/files/8bfbf299-1ee8-49b5-b27d-2d39a7886608/kenog.pdf
    • http://fomepufasele.atwebpages.com/baxibitiditufosawefaraxow.pdf
    • https://uploads.strikinglycdn.com/files/84f1650a-a41e-4739-8754-4ebabca48831/why_is_my_sky_dish_saying_no_signal.pdf
    • http://niwimugosaz.onlinewebshop.net/lijikexilesudalimaj.pdf
    • https://uploads.strikinglycdn.com/files/f4984223-9178-436e-bd2f-1ac73d9a2fdb/82360784245.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_off0000e838.bin
0068720754ad233025f21cd5bf6a1319e472a2c3a23a0ddca2ca1c9a1a2ebbf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE838 5120 bytes
font_01_sfnt_off0000f9b7.bin
b1ddf3fe3f5d323ad5fb25fa356f7a53984c09417a66be649c879dd86a9f4137		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B7 10784 bytes

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