Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f75fdf6e344df21…

MALICIOUS

PDF

67.5 KB Created: 2020-11-29 02:28:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f58f3107dc2fdfba30e9130869deee6d SHA-1: e82de679c1a4f2f16fff955678722cd44b10925a SHA-256: 1f75fdf6e344df21f2811df4b883350612f5f8c63555795601a8385a0388afb8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one prominent URL pointing to a suspicious domain. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded links suggests an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

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://trafffi.ru/strik?utm_term=come+what+may+moulin+rouge PDF link annotation
    • https://zabidikigez.weebly.com/uploads/1/3/4/5/134594795/cb8297c9fed00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378425/normal_5f8fca0a3336d.pdfIn PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/4810833.pdfIn PDF document text
    • https://lilawowawumoxo.weebly.com/uploads/1/3/1/4/131453384/45e41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408485/normal_5fa8522eada24.pdfIn PDF document text
    • https://pajowivi.weebly.com/uploads/1/3/4/9/134904739/6803417.pdfIn PDF document text
    • https://xikosenazegan.weebly.com/uploads/1/3/0/7/130739601/tujigagabisolusa.pdfIn PDF document text
    • https://jotuxopa.weebly.com/uploads/1/3/4/2/134265841/3360267.pdfIn PDF document text
    • https://jefifekelu.weebly.com/uploads/1/3/4/7/134744422/9971996.pdfIn PDF document text
    • https://fumubesoxumus.weebly.com/uploads/1/3/4/4/134485348/8117173.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wusone/xegejezotekaguf.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/que_es_bullying_escolar.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/windows_10_1511_language_pack_offline.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/coordinate_covalent_bonds_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/washington_monument_facts.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_off0000ca31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA31 5020 bytes
SHA-256: eed8fb46f19517dfe5d5b877c11ff716322cec1d00ac0c166c7deaf5fa6741bd
font_01_sfnt_off0000db2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2C 11364 bytes
SHA-256: e39f52f8f2675bc1667bbe10ed571ebe20959f1a3c436bec304b4f927acf56e0

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