Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ab0bd4194f59a3…

MALICIOUS

PDF

76.0 KB Created: 2021-01-06 14:40:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f1860ccef9763d8a9b0bdfc5771f74df SHA-1: 373f0db69998d03300eb02c2afbfda8a3c075487 SHA-256: 85ab0bd4194f59a342e0c6f71613e1361e488c2b4890751c653bd424c2606b8c
156 Risk Score

Malware Insights

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

This 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, many pointing to other PDF files, suggesting a link farm or phishing lure. One of the extracted URLs, 'https://trafficel.ru/123?utm_term=ff14+crafting+macros+5.25', indicates a potential phishing pretext related to 'crafting macros'. No scripts were extracted, but the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/123?utm_term=ff14+crafting+macros+5.25 PDF link annotation
    • https://cdn.sqhk.co/xolilipedeko/I6jjJgf/angry_crab_san_tan_valley.pdfIn PDF document text
    • https://cdn.sqhk.co/baxemazisod/ijge6dh/15162596721.pdfIn PDF document text
    • https://taruzabob.weebly.com/uploads/1/3/4/4/134493447/5898263.pdfIn PDF document text
    • https://pekireraseg.weebly.com/uploads/1/3/4/7/134720831/fejutupasuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466140/normal_5fb5449d41094.pdfIn PDF document text
    • https://nunesevafarub.weebly.com/uploads/1/3/0/8/130874378/fc90251b8699.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/760ea79b-37b9-494a-936f-b67d552d5944/72184436460.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7feeb0ee-2c6d-44e6-abd5-240783bfefe2/88424838351.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/170052d0-fc35-4e19-a28c-24b7ecf29983/86859082377.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/283441fe-949c-4030-8398-8092b789c919/8220922979.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/desejinifozidinejunulo.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BB 5552 bytes
SHA-256: 408b2ca0cd842ceb26a5cfea2c61423ef4de6d5350b3dd79f73439f1fdd27723
font_01_sfnt_off0000e4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AA 11804 bytes
SHA-256: a203704f421f5688963dcb3a927b4d84812c5b745e8b911e1ae5ffa7e14f1ddb
font_02_sfnt_off00010c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4A 16552 bytes
SHA-256: fed8268298f8667b5872d6bc50735cc488778651157cd6c868b944d85442f847

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