Malicious PDF — malware analysis report

Static analysis result for SHA-256 092f5f6e2c3f32b3…

MALICIOUS

PDF

78.0 KB Created: 2021-06-01 11:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45105e65d0aba3d3cb6d1a3dfff36022 SHA-1: d37fffcba504e914ada918cb8cee3061d5109e57 SHA-256: 092f5f6e2c3f32b347cb69f67af43409fc65a8d3de5452e656ce1494a50d9745
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://krisoc.ru/pbw?utm_term=amiodarone+hydrochloride+davis+pdf
    • https://kazobutuzag.weebly.com/uploads/1/3/1/1/131164075/f81a0393a.pdf
    • https://giwulotasika.weebly.com/uploads/1/3/1/4/131411199/3e09e2b.pdf
    • https://sopazamiwurigu.weebly.com/uploads/1/3/4/3/134387891/kivuxor-supavif-kowufi.pdf
    • https://xogepojofaridel.weebly.com/uploads/1/3/2/7/132741214/pavilonerelibe-pawinexewane.pdf
    • https://cdn-cms.f-static.net/uploads/4480749/normal_5fe9d5d251109.pdf
    • https://nugibunexediga.weebly.com/uploads/1/3/0/7/130740514/4324761.pdf
    • https://rawuwivusezorom.weebly.com/uploads/1/3/1/4/131406564/8127778.pdf
    • https://galanutix.weebly.com/uploads/1/3/4/5/134591813/zetixelodujin.pdf
    • https://cdn-cms.f-static.net/uploads/4418981/normal_5fd7d37a3104d.pdf
    • https://gozerivolese.weebly.com/uploads/1/3/4/2/134265833/rubosuwidonewujofasu.pdf
    • https://netevidogewe.weebly.com/uploads/1/3/4/7/134715311/341553.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dewubuk.pbworks.com/w/file/fetch/144422889/52060642698.pdf
    • http://niwomif.pbworks.com/w/file/fetch/144428007/concept_of_human_resource_planning.pdf
    • http://lekuzax.pbworks.com/w/file/fetch/144412230/lepivoxisenunatafezosa.pdf
    • http://pugaxigodaka.pbworks.com/f/how_do_i_reset_the_control_panel_on_a_englander_pellet_stove.pdf
    • https://uploads.strikinglycdn.com/files/76c27ee6-1998-460a-8826-f71ee55b1ad8/ssc_chsl_question_paper_2019_in_english.pdf
    • http://zajozote.pbworks.com/f/chanakya_niti_gujarati.pdf
    • https://uploads.strikinglycdn.com/files/a54c0ae1-08fb-42d6-bd8e-417385af63ac/the_five_tibetan_rites_exercises_for_healing.pdf
    • http://pokatufaxi.pbworks.com/w/file/fetch/144421107/subozutusojaxus.pdf
    • https://uploads.strikinglycdn.com/files/e0659926-e78e-4e87-bafa-a43677893a47/does_irobot_e6_have_mapping.pdf
    • https://uploads.strikinglycdn.com/files/e34d63ab-3909-433a-a0a9-3a6430859304/milidevezadixog.pdf
    • https://uploads.strikinglycdn.com/files/e6b7eaf4-6e64-4162-a975-d24c23d21f83/what_kind_of_poem_is_anthem_for_doomed_youth.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_off0000f1f0.bin
4e2be8c4555143eacdde5f9506f9861ee020f291c6b69e9c9f44e41d0062159f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F0 5548 bytes
font_01_sfnt_off000104b0.bin
e5c0a224cf3dcc201721ea99105786016032401a4611898358e459c5224f8bfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104B0 11236 bytes

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