Malicious PDF — malware analysis report

Static analysis result for SHA-256 e67364b5a2c242ad…

MALICIOUS

PDF

74.6 KB Created: 2021-02-16 01:48:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c1d903cc660afb9081d1904e3550279a SHA-1: f550f80f97fe98bc7aa71757ec07e4550ab5ac4b SHA-256: e67364b5a2c242ad29cf27b38883410e75b971adee4b01d4eb9d1c512cc446eb
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The embedded links, such as 'https://yafferge.ru/strik?utm_term=how+big+of+a+stand+do+you+need+for+a+55+inch+tv', are designed to lead users to potentially harmful sites. The ML classifier also strongly indicated maliciousness, supporting the classification as a phishing or redirection attempt.

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
  • 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 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/strik?utm_term=how+big+of+a+stand+do+you+need+for+a+55+inch+tv In PDF document text
    • https://cdn.sqhk.co/jabosuve/jbghvia/go_long_game_meaning.pdfIn PDF document text
    • https://fetevemukimagon.weebly.com/uploads/1/3/4/8/134896640/golasotena-bukizumivewive.pdfIn PDF document text
    • http://fisidunetozusi.iblogger.org/bollywood_news_movies_free.pdfIn PDF document text
    • https://cdn.sqhk.co/rilowikapaz/hbbQChd/javejonude.pdfIn PDF document text
    • http://bcpzonasegura10beta-viabcp.com/wizened_in_a_sentence_adjective19gk3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422622/normal_5fcb737cb2149.pdfIn PDF document text
    • https://cdn.sqhk.co/wofosinewok/TxF9geF/lingo_games_learn_spanish.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://towupew.epizy.com/quarterly_exam_answer_key_2019_11th.pdfIn PDF document text
    • http://vajekalisafemun.rf.gd/paxori.pdfIn PDF document text
    • http://filutapokupa.epizy.com/mobile_technician_resume.pdfIn PDF document text
    • http://gozudivigel.epizy.com/65507803339.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_off0000e42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42B 5728 bytes
SHA-256: 2d259f34196efb524e6b8361be93ba6e33dbfb5c0090de11f6db4b4102870fd6
font_01_sfnt_off0000f7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D1 11048 bytes
SHA-256: 39dd853ae5342fe0b549b561a6919774f835372c2ca34a53614984981e6bb3cf