Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5acc64f9f64351e…

MALICIOUS

PDF

70.3 KB Created: 2021-02-22 07:58:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 72ca4985e176161614b8bace693829ce SHA-1: 92e28a58175fd3abf833f95d4f43730c7e6a758a SHA-256: e5acc64f9f64351e43d2786a7987cdbd833ef3ecc237e3929d060038bb48cc91
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a redirector link and a link farm. The embedded URLs, such as 'https://yafferge.ru/wb?keyword=bosch%20silence%20plus%2044%20dba%20drain%20hose', suggest a phishing or scam attempt by directing users to potentially harmful websites. The extensive use of links points towards an attempt to distribute malware or harvest credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://yafferge.ru/wb?keyword=bosch%20silence%20plus%2044%20dba%20drain%20hose In PDF document text
    • https://cdn.sqhk.co/temirikuji/cjdibOe/93242644903.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372086/normal_5feb4f992c85b.pdfIn PDF document text
    • https://wogizirimabote.weebly.com/uploads/1/3/5/3/135337148/zapujigifuwaju.pdfIn PDF document text
    • https://cdn.sqhk.co/wutalididow/0TSqvKa/xaruneponavafuna.pdfIn PDF document text
    • https://cdn.sqhk.co/xederebat/gdhfWbF/bevirisotefi.pdfIn PDF document text
    • https://cdn.sqhk.co/puxedimuwo/hciiaje/sufaxepufok.pdfIn PDF document text
    • http://4escam-bot.online/best_baby_gate_for_stairs_without_drilling81tk8.pdfIn PDF document text
    • https://cdn.sqhk.co/furugilenu/t9igeNF/energy_anti_stress_loops_download.pdfIn PDF document text
    • http://raffle.website/650914551613bjwf.pdfIn PDF document text
    • https://wexabegolorumad.weebly.com/uploads/1/3/4/3/134351445/4482396.pdfIn PDF document text
    • https://jivekale.weebly.com/uploads/1/3/4/3/134319103/729343.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416318/normal_5fee92044becf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419654/normal_60001e1bef662.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/subopukomanaw/10082924516.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/6933607157.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_off0000d707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD707 5440 bytes
SHA-256: c8ae44285133ac1b87b499a98bef5cf0748cb47bce41ae8f349e1fdeed542492
font_01_sfnt_off0000e97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97C 10208 bytes
SHA-256: 04dff22a9f2d06b42e579489f09afc38aa27eabbf515fbaa8d031b9c9cc47664

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