Malicious PDF — malware analysis report

Static analysis result for SHA-256 4283a2b3cc9fb80f…

MALICIOUS

PDF

92.9 KB Created: 2020-11-14 05:43:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ef090a331b1ccf2a9adc5a776687a6cd SHA-1: 224459d5e383a71d3db42239beb3134b989ac65e SHA-256: 4283a2b3cc9fb80fd619fc66247639678e5b61598cc7752137ca8e7e21577341
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 0.9998

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://traffset.ru/123?utm_term=mod+menu+gta+san+andreas+pc+ita PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405929/normal_5f938cfccd5f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393348/normal_5f91e28386b1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381101/normal_5f979f8c06b73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369656/normal_5f87de6e5c17a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374518/normal_5f8f92f44d643.pdfIn PDF document text
    • https://dosijusesuxola.weebly.com/uploads/1/3/4/3/134305349/edb08b.pdfIn PDF document text
    • https://netiwixavono.weebly.com/uploads/1/3/4/3/134306625/nasevemijat-dekanute-jufagamo-xitiwepen.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/5d686b4c-758f-41eb-8384-9ace7da69bab/18357523072.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f419508-9c39-4d24-988f-e6d544a424df/45835148015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72adb14f-db65-4044-8fc0-276ebe953a9f/matlab_for_engineers_5th_edition_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/kimoweworape/10347063888.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/what_are_the_watch_hours_of_prayer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e5acad1-f115-4c8d-ab9d-b329ec71450e/92437760726.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_off0001294c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294C 5368 bytes
SHA-256: a7fbd851af63dbd2d7e713dea268ab4fe7f42226f2bd26c3b5145b362e2a3d20
font_01_sfnt_off00013b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B7F 12484 bytes
SHA-256: 140037adef70df0501dbd7bbf38fbdcfb3ac412cd6bc623906896b6d857f91d4

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