Malicious PDF — malware analysis report

Static analysis result for SHA-256 238d8ec810192855…

MALICIOUS

PDF

78.4 KB Created: 2021-06-15 13:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 827fa0e7ca7fb5cf1256bcab3ad93a6b SHA-1: 529004687d7c2c1598d4ed0960ddfa0ac0c0df12 SHA-256: 238d8ec81019285555fd44f27b2ecf764ca6255ec00ebf12582dab472c225e88
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, suggesting a link farm or phishing attempt. One of the primary URLs, 'https://medvor.ru/pbw?utm_term=15+year+mortgage+amortization+excel', is likely intended to lure users to a malicious site. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://medvor.ru/pbw?utm_term=15+year+mortgage+amortization+excel
    • https://vavivaso.weebly.com/uploads/1/3/0/8/130873957/0e86e310109739.pdf
    • https://bumogekatagod.weebly.com/uploads/1/3/0/7/130776321/juxosanuvezamufebo.pdf
    • https://ragumavul.weebly.com/uploads/1/3/1/4/131483371/3414042.pdf
    • https://buwefube.weebly.com/uploads/1/3/0/9/130969915/bekemud.pdf
    • https://cdn-cms.f-static.net/uploads/4373008/normal_6033a4ed93d70.pdf
    • https://zusadubojurumez.weebly.com/uploads/1/3/4/7/134703186/giwetikezowiloj_ripugajoravor_jaxetisimiwizo_mizugulowodaf.pdf
    • https://regifedemez.weebly.com/uploads/1/3/1/4/131406591/juwus.pdf
    • https://static.s123-cdn-static.com/uploads/4375889/normal_6000a653464f0.pdf
    • https://cdn-cms.f-static.net/uploads/4452381/normal_605220311fa43.pdf
    • https://setovejuno.weebly.com/uploads/1/3/2/6/132682792/a08d4b.pdf
    • https://mamonujiduvef.weebly.com/uploads/1/3/4/5/134525279/52300c65fc50f.pdf
    • https://cdn-cms.f-static.net/uploads/4488349/normal_6019db36806e7.pdf
    • https://cdn-cms.f-static.net/uploads/4447095/normal_602bb345bb7a4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/fc53fedc-065b-43a0-996a-ae02e0bd3373/82170724679.pdf
    • https://uploads.strikinglycdn.com/files/5d84224d-2499-475c-af34-7fa6dbc6ecf2/35236611337.pdf
    • https://uploads.strikinglycdn.com/files/95a470cf-ad26-4d88-9aff-6109695b0216/devuj.pdf
    • https://uploads.strikinglycdn.com/files/2bb98c10-d2f8-40f3-935f-1607545ee342/how_record_player_needle_works.pdf
    • https://uploads.strikinglycdn.com/files/a5bb2fc4-b838-4c48-aa81-3d9274f9d0c8/41508662959.pdf
    • https://uploads.strikinglycdn.com/files/7c9817cd-d781-4c1e-9e98-9a1046bd165b/star_wars_the_old_republic_revan_sequel.pdf
    • https://uploads.strikinglycdn.com/files/dca9cf50-f442-4c43-bd59-497d862462a6/how_to_tie_a_knot_for_fishing_weight.pdf
    • https://uploads.strikinglycdn.com/files/db2810a4-bcd5-4d5b-ac13-4d08779bd925/citizen_eco_drive_watches_cheap.pdf
    • https://uploads.strikinglycdn.com/files/c3ad2995-21d6-4891-b707-f7897c19e16a/what_is_adaptive_skills.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7cd.bin
8e5d87f43de30d6db086f0622815c0613d3db62d880536f7e5331812aa43ea74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CD 5032 bytes
font_01_sfnt_off0000f8e2.bin
1cca605a7e5a24082f7f3f9fac2308be77d178d1eac6d4c956cc395273329efd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E2 10784 bytes
font_02_sfnt_off00011de8.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE8 4324 bytes

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