Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c0a0df89b7c128…

MALICIOUS

PDF

72.0 KB Created: 2020-11-19 20:39:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 254814e137e434ff903b815a7cacffdd SHA-1: 9da739aed3121516cf4abdce2ab920586631bad8 SHA-256: 71c0a0df89b7c12822ea86ae758698e10c9039f44f6ef706b15e1c1ca56eb025
156 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 0.9996

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://traffine.ru/123?utm_term=andes+mint+cake+delish PDF link annotation
    • https://redilabow.weebly.com/uploads/1/3/4/3/134316718/6030152.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402951/normal_5f98aadf8f939.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445115/normal_5fb2cae84ab81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413002/normal_5f95d6789be10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375885/normal_5f8a2e2f14f9c.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/565df144-bff8-477e-a3a6-91fda430d8d0/91160437243.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aa232d1-8346-42f7-ac15-ab6ece728d6f/78714865034.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3594936-b97c-4b32-9547-8a8c4d65f87c/dekokiwenefas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d055e3b-4aad-4239-bc5a-c14725b3ddcf/28223001485.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/def53201-5b30-4694-8c68-346c244d0808/78419880863.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f576776-3fb9-40a9-adf5-944d2c30a610/venuvawideza.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75F 4812 bytes
SHA-256: b3fe1c3eb89c35a6bc4592085f479a454ff91a49266ccead3280c1ebd37c7854
font_01_sfnt_off0000d775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD775 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off0000e003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE003 10968 bytes
SHA-256: 5d639d373d43a2ef06c2abab72551061b9646cfc79c3855b0112365f829e8d21
font_03_sfnt_off00010507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10507 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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