Malicious PDF — malware analysis report

Static analysis result for SHA-256 2115f4197a8ea39a…

MALICIOUS

PDF

88.0 KB Created: 2021-04-06 19:41:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 081f66ad20d6ff2f8fc4fa72ab11c70d SHA-1: e84e2985fe53731f78d0b3639cfaf79c60f0176d SHA-256: 2115f4197a8ea39a7634e5b9e7be8a9f45b22a6f871be52fd1e4a140e6a2523e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, with the primary suspicious URL being mezovuduw.ru. The ML classifier and ClamAV detection strongly indicate maliciousness, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to redirect users to potentially malicious content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://mezovuduw.ru/award?keyword=bessie+head+when+rain+clouds+gather+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459025/normal_5fe771ffe43e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454287/normal_5ff2b1e2b7e17.pdfIn PDF document text
    • https://cdn.sqhk.co/xafogatok/jgePwgj/28694969212.pdfIn PDF document text
    • https://cdn.sqhk.co/tamejenonisi/blhiibY/86015041090.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/0ff875ab-e4a0-45b9-a747-b9603b808d68/stpm_physics_definition_list.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/lasimisefovela.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/exerpeutic_bike_900xl.pdfIn PDF document text
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_81ee4d2d86fd4d94b7ec25e446e1f9bd.pdf?index=trueIn PDF document text
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_5a51a285645847e7b86ca162a217f7cb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/libosokune/litoluwenonuladidimomuves.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2be07de5-ee09-480b-835e-fb97804e046f/xinaror.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1533b39e-e667-4b1c-9b61-cd15cb957d0e/suxenoxunezulef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6acb4b4-c7e6-4159-b0e4-dd79093b7224/every_other_day_diet_health_benefits.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/51482477567.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/31489887108.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/witufemesofebovurufuke.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/java_jdk_6u211.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA3 5440 bytes
SHA-256: bbd8cb74ed60848b839f9f960dfd1a866c7e8b9db8f4d4851a75df56d7bd6f3e
font_01_sfnt_off00011e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2E 11256 bytes
SHA-256: 45743a69e1321cb795368d8277ab4a7705730569c0e5e5a07a18d147d6f48685
font_02_sfnt_off0001448e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1448E 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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