Malicious PDF — malware analysis report

Static analysis result for SHA-256 6181e305d22f91de…

MALICIOUS

PDF

80.0 KB Created: 2021-02-19 19:35:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 47c125e9310bb5c6e4c35cfe5bde3dd1 SHA-1: ef83f10884ebd50de508dc7185569d03a7d62dae SHA-256: 6181e305d22f91dec05abb1b4ecf7f687ba70755a578d4ceb77203f9d96e03f8
184 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The embedded links, such as 'https://crophysi.ru/strik?utm_term=the+dark+tower+vii+ending', are designed to redirect users to potentially harmful sites, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself facilitates the attack.

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://crophysi.ru/strik?utm_term=the+dark+tower+vii+ending In PDF document text
    • https://cdn.sqhk.co/wazewiput/FgegWgf/tolupajet.pdfIn PDF document text
    • https://cdn.sqhk.co/mosugukasiba/fjglih7/castle_crashers_wiki_bosses.pdfIn PDF document text
    • http://dvertsoff.ru/754405504920uwip.pdfIn PDF document text
    • http://doorstepcomputers.com/panchdev_atharvashirsha_download1gzf2.pdfIn PDF document text
    • http://tameeniraq.com/61451647102kwg3y.pdfIn PDF document text
    • https://cdn.sqhk.co/risenulowo/2Ffhggc/51501032093.pdfIn PDF document text
    • http://opt05.ru/user_guide_for_iphone_8l10mh.pdfIn PDF document text
    • http://trysoda.pro/onychomycosis_topical_treatment_guidelinestgde9.pdfIn PDF document text
    • http://shoop-fe.ru/gazetted_officer_format_for_aadhar_cardopj60.pdfIn PDF document text
    • https://cdn.sqhk.co/furikute/xifihjf/space_invader_7_xbox.pdfIn PDF document text
    • https://mujolimu.weebly.com/uploads/1/3/4/8/134868529/aa9962e0.pdfIn PDF document text
    • https://rupogasonewu.weebly.com/uploads/1/3/4/6/134653860/5cb6485d035c.pdfIn PDF document text
    • http://ionatr.space/18556146614eutm9.pdfIn PDF document text
    • https://suruwizad.weebly.com/uploads/1/3/4/7/134766156/tapiset_rufepiw_sizapowedef.pdfIn PDF document text
    • http://yourbigdick.space/probabili_formazioni_sportmediaset_3_giornatalgmca.pdfIn PDF document text
    • http://1xbet-football.fun/54607807174yncg5.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/xeruxaxer/62547224917.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/35716877030.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/vutozuwojiga.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/sitopezapilamujunemi.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_off0000fa7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7D 5044 bytes
SHA-256: a2a06ae727d8f7e4eb3122aa6dd47787326ab2b91d68ef2b93ba15fab1e7211d
font_01_sfnt_off00010bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB4 10904 bytes
SHA-256: 5269963aaa1136eb9cec955331ef7c42b627aa2a31a27373082ea1d4f4de0eee

Open this report in the interactive analyzer, or submit your own file for analysis.