Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b4008f93c8e493…

MALICIOUS

PDF

73.8 KB Created: 2021-04-03 08:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c35ee481c0da79b7cd262f4251f78f2 SHA-1: 2346fa03f187f136b0e3687172205da8bb2802d2 SHA-256: 04b4008f93c8e493aea4b7fea87768a13fb4b810b96b29f8f78139ae6f93d92e
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many pointing to PDF files hosted on various platforms, suggesting a link farm or SEO manipulation tactic. One of the extracted URLs, https://nipisod.ru/123?utm_term=broader+performance+transmission, is likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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
  • 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://nipisod.ru/123?utm_term=broader+performance+transmission
    • https://lusezatakobav.weebly.com/uploads/1/3/4/3/134352635/866dbdd458c08.pdf
    • https://famalekirujapa.weebly.com/uploads/1/3/1/4/131453917/9301202.pdf
    • http://fuvisetitisenon.mypressonline.com/is_shade_really_dead_red_queen.pdf
    • http://tiwimifozukimu.medianewsonline.com/jerusutusolipebipagule.pdf
    • https://suzotavuni.weebly.com/uploads/1/3/4/7/134765747/6575800.pdf
    • https://selotisatopus.weebly.com/uploads/1/3/1/8/131856190/f5186b927a.pdf
    • http://nefozufovi.scienceontheweb.net/jaxagiluwezuwarobanuzekor.pdf
    • https://nefopenexa.weebly.com/uploads/1/3/0/7/130739549/4821407.pdf
    • https://koropiliful.weebly.com/uploads/1/3/0/7/130740252/2025056.pdf
    • https://tevumusavobe.weebly.com/uploads/1/3/4/1/134108657/5530015.pdf
    • https://xakanokemuma.weebly.com/uploads/1/3/5/9/135965718/e519e423c446e5.pdf
    • https://xupemapimosow.weebly.com/uploads/1/3/0/7/130776757/67f79958af0.pdf
    • https://gevuloluwalew.weebly.com/uploads/1/3/1/1/131163761/jesavolurefafop-tejenodeb-dopug-mufodigum.pdf
    • http://kimokabif.medianewsonline.com/japejivebinuno.pdf
    • http://zisuroto.mygamesonline.org/69720134080.pdf
    • http://faxusupovetek.sportsontheweb.net/vipassana_meditation_technique_body_scan.pdf
    • https://sixutaxujarupi.weebly.com/uploads/1/3/4/8/134882582/rimenugobopiki_kuzimona_pekeduxemuva.pdf
    • http://rulabepotinujeb.mypressonline.com/4752908601.pdf
    • https://zosujugopaw.weebly.com/uploads/1/3/4/5/134509911/lobefapo_gesij.pdf
    • http://mapotilij.mygamesonline.org/idylis_freezer_not_working.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/28a2437b-fd8f-4f84-8ddb-d9dbf28c0fb6/how_to_learn_programming_from_scratch.pdf
    • http://fiforeru.atwebpages.com/54194663525.pdf
    • https://uploads.strikinglycdn.com/files/fa94b648-8221-4b33-9fcc-6936157cb819/stand_mixer_cover_pattern_free.pdf
    • http://pusebirenox.myartsonline.com/perfiles_de_aluminio_catalogo.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_off0000e2b5.bin
28814ef91a236f4f30f0bfd84d9edd681152fdd8ba9472dc7595ecdeac9fbc71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B5 5320 bytes
font_01_sfnt_off0000f4b6.bin
d72dbabb97c97d69bf5219de1a3f4d16f576ddd5a5f8d2dee783413d3184e2a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B6 10924 bytes

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