Malicious PDF — malware analysis report

Static analysis result for SHA-256 822f5b08d50194f3…

MALICIOUS

PDF

77.9 KB Created: 2021-06-09 07:23:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0b52f720740365fe5211c97b2ed1632a SHA-1: efb2358d58685499e7df936cb9f03eb56533b5ac SHA-256: 822f5b08d50194f35b00a1bdd7f9cc675f4f18f3b047c1c5a366554a94f0d385
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, forming a link farm, and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. The embedded links likely lead to malicious content or further phishing attempts, suggesting a spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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.
  • 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://catamma.ru/pbw?utm_term=implementation+plan+sample PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446931/normal_603b127273936.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368958/normal_6007efe4c00c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370264/normal_6027bf9dba088.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368976/normal_60bd758549ae8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473375/normal_5fe83c28ec884.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403823/normal_6050e496515b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413846/normal_5ff2f959089c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471114/normal_5fd7ea002cd31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495042/normal_5fd671fc30582.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467927/normal_602dd4f9b0061.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471682/normal_5ff0a64cb874f.pdfIn PDF document text
    • https://kodugeji.weebly.com/uploads/1/3/6/0/136089350/54b8038689dba4.pdfIn PDF document text
    • https://dixelopenam.weebly.com/uploads/1/3/4/5/134590152/videbozimimosenazi.pdfIn PDF document text
    • https://wemodolitafuroj.weebly.com/uploads/1/3/6/0/136055174/tugewasob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393511/normal_60415e71954b6.pdfIn PDF document text
    • https://rowusebejaron.weebly.com/uploads/1/3/1/6/131637242/puwigasederoletat.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4384463/normal_60b000e34d327.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417664/normal_5ff8677ddfa24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471484/normal_6050c50f91038.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuwedateredu.pbworks.com/f/zokudukabatofuket.pdfIn PDF document text
    • http://garewewaziwu.pbworks.com/w/file/fetch/144543078/13462859199.pdfIn PDF document text
    • http://niluputevi.pbworks.com/w/file/fetch/144452466/giftedness_aspergers_disorder_checklist.pdfIn PDF document text
    • http://zepupifob.pbworks.com/w/file/fetch/144426660/gurekafefusufinaravisuwi.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_off0000f6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E7 4804 bytes
SHA-256: 0978f07deb91acc43b22e667c34a7d765e2681e23b31e42246381dcf3bd56082
font_01_sfnt_off00010727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10727 10460 bytes
SHA-256: 1da2806b187a06432b73c9676a0fbde714e546c0c9f25d93423f493d1f330ab3