Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f3c76a5c86abf0…

MALICIOUS

PDF

77.1 KB Created: 2021-01-09 18:00:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 35c9764454d381727578d6beebe0d0a3 SHA-1: d939c3c6fe2e1e3825be8ff84dd28b613e1cfe92 SHA-256: c1f3c76a5c86abf0b4373cfca1368f73e6a8346e4c6f1a084c0a83ed3f9a6b6e
214 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to a 'TP link re200 manuale italiano'. The presence of numerous external PDF links and a critical heuristic firing for a malicious redirector strongly suggests a phishing or malware distribution attempt.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=tp+link+re200+manuale+italiano In PDF document text
    • https://static.s123-cdn-static.com/uploads/4388280/normal_5fc921cf8e1e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485689/normal_5fadc96b66117.pdfIn PDF document text
    • https://tolajugim.weebly.com/uploads/1/3/4/6/134647220/41e34448.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451047/normal_5f9f1907613f5.pdfIn PDF document text
    • https://fisalusul.weebly.com/uploads/1/3/4/3/134341538/xivaxidafubij_jukutudukaf_lupigaderubijo_jalozigubu.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/ba05a69c-4800-4427-b1aa-6520055a3dad/11379916771.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78f4b4e3-88c4-47fc-8812-85b8ab68ad36/91004991.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e37a622-6ea9-445f-b97f-5b1b362e8e6f/sifulu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0b008d1-7456-4ae9-aa3d-d82a6bda9b5e/free_music_app_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/875aa109-9af9-4a28-bee4-30f8b1c2e296/xivupewi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6c3d889-5405-4dc7-bb66-97722fa2eb55/9407713211.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2de0da6-9ce6-42db-a0d2-7572e43f6cf4/zifojowo.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_off0000eefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFD 5076 bytes
SHA-256: 5d0ba566237489200c9f5c4b84c7e1b165ef65d8739ef8514ed1e37a107df4d9
font_01_sfnt_off00010024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10024 11480 bytes
SHA-256: 7505b29dc582b24c39e74d2a77fa48066148fce5be44266eeeb4a8c7970340b6

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