Malicious PDF — malware analysis report

Static analysis result for SHA-256 6904279e3a7b69d8…

MALICIOUS

PDF

78.2 KB Created: 2021-03-20 10:45:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0814e7442bdf7478518083965a334935 SHA-1: e38807f2e97678734fd12faa40153bb5dbd61ea0 SHA-256: 6904279e3a7b69d87bb05b9178935b6b29611cedeb2ece7f879e2eb3693e7de5
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://soxebez.ru/award?keyword=braden+scale+for+predicting+pressure+sore+risk+pdf', indicates a potential phishing lure related to a medical risk assessment. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/award?keyword=braden+scale+for+predicting+pressure+sore+risk+pdf PDF link annotation
    • https://cdn.sqhk.co/zalivelo/jViixvE/13877138394.pdfIn PDF document text
    • https://cdn.sqhk.co/seponidozit/haXZtjp/bubble_shooter_bongo_balls.pdfIn PDF document text
    • https://cdn.sqhk.co/senosekagoko/9iahjwC/jedaxewexe.pdfIn PDF document text
    • https://cdn.sqhk.co/zezetemirag/ifYibMr/learn_spanish_vocabulary_games.pdfIn PDF document text
    • http://fejiximodanu.mygamesonline.org/59919929462.pdfIn PDF document text
    • https://cdn.sqhk.co/rinugezig/9Tnjh0p/space_armada_galaxy_wars_apk_mod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_9024bb86097b466ebfc309b92c83223b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a8aa8e5-78d0-41bd-93f2-cade72a089df/10038275288.pdfIn PDF document text
    • https://2a1457bb-a4d2-449b-8914-d784a503a6da.filesusr.com/ugd/c0fca2_b643f4c279954ed380b8a8ed0086abd9.pdf?index=trueIn PDF document text
    • https://74df6fe0-557b-4e47-8461-f2df536053d0.filesusr.com/ugd/4dcf4e_335ff61a394742d4898e3b45bd4bb8c9.pdf?index=trueIn PDF document text
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_2860bfde997f4bdeb5f5a7b401fb9242.pdf?index=trueIn PDF document text
    • http://mujebik.atwebpages.com/mthodes_d_analyses_biochimiques.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bbd2271-54d0-459a-8be7-a77b947dbfba/captain_underpants_book_series_age_group.pdfIn PDF document text
    • https://f3b8d348-8566-49c9-a9f8-a2c3b9e1bc8e.filesusr.com/ugd/f1c748_dfc4e0cfa95c495db0480c10a5e4f4c2.pdf?index=trueIn PDF document text
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_54c972ae312b4ff3afef39c6d55fcd87.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb699ac9-25a7-4198-8ada-097a316e1a43/73362016307.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc26344b-947e-4fd0-bbf7-373864e48297/apple_airport_time_capsule_2tb_storage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d84d19d-f754-47b9-b846-a1f61ae27c9d/86551444877.pdfIn PDF document text
    • https://b585a76b-fab5-4024-b0d2-f3ad95444197.filesusr.com/ugd/404203_778f8aadcee64b2dbb3b129febeea0f8.pdf?index=trueIn PDF document text
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_8f4312f7956944e8a612d8096ee4c0b3.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF20 5436 bytes
SHA-256: ee5d8f09e68c00dfcc3a2d14f8284ed86432ba7b5a414974151aaa5718060650
font_01_sfnt_off000101b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B6 12580 bytes
SHA-256: af2d06971b6bc36f6e92c25b2ca1b649bf0e6ace4f73f2ea61c8159cbd28e5f2

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