Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d35dd24c8f2bc4…

MALICIOUS

PDF

79.8 KB Created: 2021-03-11 09:04:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f9dc4863384391ca9406f9da987831b5 SHA-1: 638cd70bcbad4b7e1c9c4b3655c8a76e8f01dc7e SHA-256: c2d35dd24c8f2bc42a61d29a108f95a34a43b5396f5c86455aa29680b86a0bc0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://zajinet.ru/123?utm_term=eu+project+concept+note+template PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4478393/normal_5fc86df1bf097.pdfIn PDF document text
    • https://bodovusinorone.weebly.com/uploads/1/3/5/3/135347185/baf37aba11f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497082/normal_601a6fadd74ab.pdfIn PDF document text
    • https://sujoxiwu.weebly.com/uploads/1/3/4/8/134879933/pebuwixegixuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465000/normal_5fed10aacd651.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412377/normal_60443fca8ddbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446395/normal_6009f07f3c135.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445882/normal_5ff2f55fe4a07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369179/normal_6032adf7e7f7d.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/788eb160-8603-4be9-bf89-2b83f9b4a695/what_is_the_salic_law.pdfIn PDF document text
    • https://40ba1f7a-6e91-49bb-bbb8-dfbb40a2bc60.filesusr.com/ugd/22bf55_4913143060b841f5a1d7c2b3bfbff98d.pdf?index=trueIn PDF document text
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_5815c64bcfa04b4c91368c2b9599dcee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c96bd79f-5183-4a00-aadc-6a2dc0ba9b68/how_to_check_title_deed_in_kenya.pdfIn PDF document text
    • https://cef8af8d-7071-4339-ac50-fc417d371010.filesusr.com/ugd/a89196_bf5b1a1ea75648c1b15dc47760a37c49.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5167c148-eecc-476e-a791-7359b87ed5ac/why_wont_my_bissell_vacuum_not_suctioning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bda4d92-4f94-4ec5-8441-ede62afee1bc/73247602048.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07522bd5-97cc-4f9a-9850-d1cf15b922fa/ford_501_sickle_mower_parts.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_off0000ef82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF82 4768 bytes
SHA-256: 020c549bdea1cf2c5e30d4aa1905076e1104eddd6f0994d09718ad0cd2099643
font_01_sfnt_off0000ffa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA4 10700 bytes
SHA-256: 122815a5183292cf48cf164a7ea11994d4d756e63c5dac2965d0283108b1cd0f
font_02_sfnt_off00012420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12420 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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