Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a9b944a3e948958…

MALICIOUS

PDF

65.9 KB Created: 2020-11-14 06:34:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 38b071ae28988a896bbf2bfb09b1ba1a SHA-1: d6c87a47db0af63beaf54f89541ca6d9c2fe21e1 SHA-256: 2a9b944a3e948958449da672e82a01bcda6377ed41c05ef6f5b4a63e80cb8993
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to seemingly unrelated content, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host numerous URLs.

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/aws?utm_term=cissp+study+guide+syngress PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365634/normal_5f9c91cb268cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382614/normal_5f9dc297bcfc5.pdfIn PDF document text
    • https://gamorajemusuro.weebly.com/uploads/1/3/4/3/134316050/pubunisenutejozukif.pdfIn PDF document text
    • https://xonuveviriniw.weebly.com/uploads/1/3/0/7/130738603/3d93db38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366011/normal_5f87082c4579e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368958/normal_5f984a1e32063.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/a31eb3a8-0eac-408f-87e5-3b370b6bf61c/18948449651.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/76848134597.pdfIn PDF document text
    • https://s3.amazonaws.com/bexolamabad/10277419616.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c73b5396-b036-4507-aed8-7c4cb26c69b5/buffalo_chicken_burgers.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/lil_abner_movie_1959_cast.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/allah_allah_video_hd_song.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/astral_centre_de_formation.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/22086493829.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/kisejalutazutexupezuj.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_off0000c634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC634 4892 bytes
SHA-256: 43f317143ca6de17f97200d88e4f4700d80be964da15fbea8627ebbe933c020c
font_01_sfnt_off0000d6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EF 10772 bytes
SHA-256: b7f3f43cf6349a6e4b3a3dd3d0ea967a794882d92d49499ac01f9a9285c4cc8c

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