Malicious PDF — malware analysis report

Static analysis result for SHA-256 865e4ed5bb65140f…

MALICIOUS

PDF

39.1 KB Created: 2020-11-09 04:58:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: dec1bef9725c0cff4320ca51847f61d1 SHA-1: 8aa18d08cbde064adcb6109a27c228979ee4653c SHA-256: 865e4ed5bb65140f69b682f67f175e513ce9961958fb526b2c3378ce2a4bbb5a
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly and S3-hosted PDFs, indicative of a link farm or SEO manipulation tactic. One of the primary links, 'https://traffset.ru/aws?keyword=roadkill+cafe+md', suggests a potential lure related to search engine optimization. While no scripts were explicitly extracted, the PDF structure and numerous embedded URIs strongly suggest an attempt to redirect users to malicious or deceptive content, likely as part of a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://traffset.ru/aws?keyword=roadkill+cafe+md PDF link annotation
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/6d5db6ae5452625.pdfIn PDF document text
    • https://totobulamu.weebly.com/uploads/1/3/4/3/134310137/5f0328e.pdfIn PDF document text
    • https://pitimonajavigo.weebly.com/uploads/1/3/1/3/131383860/7526000.pdfIn PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/408821.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://s3.amazonaws.com/kakef/55149878010.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/learning_agility_assessment_korn_ferry.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/6640735703.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0dfb11f-7a7f-4dce-b656-95873787f9f6/65029907000.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/fahrenheit_451_answers_part_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8c23c74-86ff-4b2f-8d41-421691bb373c/22686836266.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/795c406a-27c4-476a-9ebd-b0c225ca50dc/fimovosuxajefaletuxexib.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/lagidaxanixunijakab.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/49824564175.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_off00004edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4EDB 4564 bytes
SHA-256: 6ef8f5f1e82b75f9a5553dec9c7009de28e2c23550c40d5ec0f27f1fbd7b0f5b
font_01_sfnt_off00005e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E66 10512 bytes
SHA-256: 23f675b25094e5e5660344eb920bcfb11f91d224ddad7f9f0454b5e50151bb45
font_02_sfnt_off000081eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81EB 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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