Malicious PDF — malware analysis report

Static analysis result for SHA-256 633fa0e7eefb68ed…

MALICIOUS

PDF

91.7 KB Created: 2021-05-28 07:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: d4f96685636e63cc951c1e070cc2077f SHA-1: ac51470294d8a0ddf4f14fe905a678406c1db8a6 SHA-256: 633fa0e7eefb68edcebe293876a29166e2a8edf333f51f3ec30548c75d17965b
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The embedded URLs likely serve to redirect users to malicious sites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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 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.
  • 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://jottigo.ru/strik?utm_term=how+do+i+study+for+the+notary+public+exam+in+ny PDF link annotation
    • https://rebigakudaj.weebly.com/uploads/1/3/1/3/131383708/penepavo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413473/normal_5ff23d371eabd.pdfIn PDF document text
    • https://xosufovopoxom.weebly.com/uploads/1/3/5/2/135298930/ed5a33607.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487927/normal_6009f504c8090.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416316/normal_603a3e8b38de5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455374/normal_5fdc13d337389.pdfIn PDF document text
    • https://mowazaxof.weebly.com/uploads/1/3/4/7/134704653/40340c3911.pdfIn PDF document text
    • https://besunuvoduzusub.weebly.com/uploads/1/3/4/2/134266379/gumakonubekilase.pdfIn PDF document text
    • https://pamibatofenowa.weebly.com/uploads/1/3/4/5/134525539/duvujimapa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366959/normal_6032b0d6ba166.pdfIn PDF document text
    • https://rebusisi.weebly.com/uploads/1/3/4/0/134017700/2d69982e13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380070/normal_601c95c341a3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392439/normal_60154c67754b2.pdfIn PDF document text
    • https://fupomojokom.weebly.com/uploads/1/3/4/4/134458651/1439266.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393179/normal_60236bf17b171.pdfIn PDF document text
    • https://gefelamanak.weebly.com/uploads/1/3/4/3/134353999/a40e9a25320b7.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/a60563ae-c3a1-4078-858a-a48ca813d042/how_to_use_active_learning_strategies_in_teaching_of_islamiat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0168f5c7-443e-433b-99b0-036151181935/92859315131.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4e6d946-0dd1-41c4-b682-a59788924a25/1986765792.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93ab8f87-e08d-447a-afc3-a1a6633cc92a/78147520464.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba7279f6-bcb8-441c-af65-722e508688e5/16263810701.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4b19fa9-76fa-4b04-ae04-61f77014062d/the_end_of_the_affair_graham_greene_characters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/005b7835-5659-4723-a7df-fba13617433c/dibijepiwopamet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc678f88-dcde-4c8b-b786-2d1226f28e14/goliath_must_fall_study_guide_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b02602c5-13ae-426b-8c18-366fc144d906/7660272194.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF9 5760 bytes
SHA-256: 6dace40a5392b2f9dcf0ed9b011d43d6e6e707206bbd7eeecd3044ec51f1a9ad
font_01_sfnt_off0001237d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237D 11196 bytes
SHA-256: 30c1edaf0daa8cdec91e69f6386f3fe1a2fafa03ee2f133bdd55612189c81b49
font_02_sfnt_off00014982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14982 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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