Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cfc4bc0e3f0119d…

MALICIOUS

PDF

72.1 KB Created: 2021-02-22 02:40:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 4b283da1abed44f7d787a44676d1a279 SHA-1: 7a6042cb61668def6af2bd73f7af21300e401836 SHA-256: 8cfc4bc0e3f0119d2a56204dcabab3f97fe6b711a620fa1b39467b827e8ff846
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though partially corrupted, contains text related to 'certified mail slips', likely a lure to entice users to click the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=how+to+get+certified+mail+slips In PDF document text
    • http://adanakebap.org/31180004310td8pn.pdfIn PDF document text
    • https://gobewuguwug.weebly.com/uploads/1/3/6/0/136056794/raluj.pdfIn PDF document text
    • http://iglivesupportteam.com/curriculum_guide_grade_11_pe4tgo0.pdfIn PDF document text
    • http://magic-spring.com/70375960688pjlqf.pdfIn PDF document text
    • http://helpcontactform.com/what_is_the_domain_of_social_work_researchdqjbu.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/silubebebefuju/fosusiripotosere.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/73571741676.pdfIn PDF document text
    • http://dalonirutufitad.rf.gd/50283370408.pdfIn PDF document text
    • http://fasokefukolu.epizy.com/flight_pilot_simulator_apk_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/carrom_pool_apk_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/soft_skills_powerpoint_presentations_free.pdfIn PDF document text
    • http://podapuleleg.epizy.com/35639695292.pdfIn PDF document text
    • http://pinogizege.rf.gd/zuvapopu.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/lewolidajonivamedilifapow.pdfIn PDF document text
    • http://vapodizasogore.epizy.com/48992830944.pdfIn PDF document text
    • http://vujexufekazama.rf.gd/how_long_to_learn_how_to_trade_forex.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_off0000ddff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFF 5528 bytes
SHA-256: 1241cd8e1c7da4735de4c0a44129a165ebf029b7e0a14bfb45050e57378079a1
font_01_sfnt_off0000f0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CB 10296 bytes
SHA-256: 81f5ec079b515c04da789bf9d66ecc5e8a5211dca1287ad8c94fa8a01217519c

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