Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b608aa3eb0875c…

MALICIOUS

PDF

66.6 KB Created: 2020-11-18 10:30:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 23f088155cae5ee58976a8867c33d338 SHA-1: 9593ae76827dfe302e46d71ac4fd86f3eed8c65b SHA-256: b1b608aa3eb0875c99a30747e80af2fdd52e88dd4147387b3e00076ff9863fff
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary URLs, 'https://trafffi.ru/123?utm_term=things+fall+apart+reading+guide+answers', is suspicious and likely leads to a phishing or malware distribution site. The document body, though partially corrupted, suggests a lure related to a reading guide, aligning with common social engineering tactics. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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/123?utm_term=things+fall+apart+reading+guide+answers PDF link annotation
    • https://ketabanajav.weebly.com/uploads/1/3/4/7/134707818/4484445.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449172/normal_5f9fe30745b46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414852/normal_5fafde4cbe9d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368745/normal_5f978254be6a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384828/normal_5f8c40738a3c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421336/normal_5f9a40160e5af.pdfIn PDF document text
    • https://gowumobajakexe.weebly.com/uploads/1/3/4/5/134585768/dufik-zozizutejos-xedugidokokuxi-pabojotujemez.pdfIn PDF document text
    • https://zofomuwane.weebly.com/uploads/1/3/4/0/134040850/parisudinozabuzov.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/7225a759-0740-4875-8635-e9ca9a9cda17/behringer_q502usb_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f4e1d99-2194-4162-b98f-50503fc2d75f/munchkin_push_to_close_extending_met.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67286170-034f-4367-a98d-fcc41b527b97/vanokavasixunivomasako.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8102e29f-ad65-4dfd-aa52-9361c5e74764/kidewagipobefawixi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89a04264-ab02-47b5-8c9b-1613a7b4eba4/rekit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/862496b0-0f88-4eca-8b38-69e377086405/harry_potter_book_1_name.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_off0000c508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC508 5344 bytes
SHA-256: da8eccd397cc9163d1ed84c26aab21a29d8ab24dfb48d4837fbc7af9c34834b6
font_01_sfnt_off0000d745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD745 11880 bytes
SHA-256: 35205219e81cc065529256118897e4183bb121cf70696127f7196b96e401d778

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