Malicious PDF — malware analysis report

Static analysis result for SHA-256 6158e153f22dd828…

MALICIOUS

PDF

80.4 KB Created: 2021-03-08 03:22:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: cc7bf35ed00a4687a996c6ada1e9bcda SHA-1: 49a1ae46af6c889e1a31dbe4d989d9982399551f SHA-256: 6158e153f22dd828cb379e9edaf6a9c4f51d329db62d77f4f691b9fe1eb7437f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, with one suspicious URL pointing to 'pelibifir.ru'. This suggests the document is part of a link farm or SEO manipulation scheme, potentially leading to malicious content or phishing pages. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/wix?keyword=osu+sensitivity+converter+valorant PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390641/normal_600b3b512cd2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469850/normal_5fe6c0f16d6c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410678/normal_602b5b31ac782.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463554/normal_6013a4db0f41f.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/65b2dded-3129-48f0-9239-5cbc5bc59561/vw_polo_1.4_tdi_workshop_manual.pdfIn PDF document text
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_fdde219c628a47b4ac37110f3bd93aaf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd09047e-9d5c-4ae8-bae8-d325e2ff467a/innova_3020_scanner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8921a23e-44a5-4c6e-b251-6f77e3220670/bifibejorobifovaraju.pdfIn PDF document text
    • https://c7f0abc7-d23b-482d-bd16-0771495bb668.filesusr.com/ugd/bb13a2_1afef2e69d4844e38f79c0fc6d6f568e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/06560e0f-fbac-4f09-8c7c-da787a7472b3/44252342817.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8623a75d-4d6c-47fc-a74e-476991cd80b0/how_to_make_pizza_dough_from_scratch_without_yeast_and_baking_powder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0f54381-7c95-4f7d-a73c-93f17ed4edfc/tuvunusejerisesem.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/google_maps_europe_offline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9638564a-8293-4e23-b49a-ad9e4b755939/90630313639.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/dajorovezegemo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b1fc507-461b-409e-b328-2943ff127194/27933195514.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec35d37d-f2b9-4659-8e1d-a7a3667d8e21/10833894051.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f2638b6-6314-401c-9344-06e7930f1b2e/98452373418.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/egg_mayonnaise_sandwich_nutritional_information.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9270573f-a839-47fd-92f1-342f51547197/how_to_consume_soap_webservice_in_java_without_wsdl.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF71 4980 bytes
SHA-256: 0d865299777e863656abfd3de30a4818ee76268225023c4dff44f28dd1844521
font_01_sfnt_off0001107c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107C 10468 bytes
SHA-256: eeda040355a7c8bbe5422528a0e65e20041c3eb5abae87e58dc4a49c344ce88b

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