Malicious PDF — malware analysis report

Static analysis result for SHA-256 364db69aa4d1d2a4…

MALICIOUS

PDF

74.5 KB Created: 2021-02-16 22:55:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 21515159236e9972e48d6eb82f70cb10 SHA-1: 59bb5de6ed4a7fad4213f57b5d9fda8a89869fa8 SHA-256: 364db69aa4d1d2a45526fb3997e364cb1a63ef641cb37f98c33040c5af80e9c6
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML heuristics flagged this PDF as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

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
  • 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://jottigo.ru/strik?utm_term=what+is+samsung+one+connect+mini PDF link annotation
    • https://cdn.sqhk.co/gopuxipo/dhgjj8h/tramp_simulator_survival_city.pdfIn PDF document text
    • https://cdn.sqhk.co/rureroso/j6ge491/minizosajebavuxeliw.pdfIn PDF document text
    • http://tevajevidiwa.22web.org/12207227313.pdfIn PDF document text
    • https://zasawebisev.weebly.com/uploads/1/3/4/8/134865024/3831094.pdfIn PDF document text
    • https://gamevuwi.weebly.com/uploads/1/3/4/5/134525912/tovufa.pdfIn PDF document text
    • https://jolosusopafo.weebly.com/uploads/1/3/4/0/134097145/97d74cb2a2c4.pdfIn PDF document text
    • https://wujenorap.weebly.com/uploads/1/3/5/3/135322769/b17be4bc88f7d69.pdfIn PDF document text
    • https://gatiwisukebemo.weebly.com/uploads/1/3/1/4/131438587/8180791.pdfIn PDF document text
    • https://lerizizevu.weebly.com/uploads/1/3/4/3/134314130/6d10641604.pdfIn PDF document text
    • https://kexexetipo.weebly.com/uploads/1/3/4/8/134897314/nusokani.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovebakeb/jbhgieK/pokemon_go_ghost_type_tier_list.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vutakeba.epizy.com/vanguard_brokerage_account_application_form.pdfIn PDF document text
    • http://xaredekol.epizy.com/nephrotic_syndrome_clinical_practice_guidelines.pdfIn PDF document text
    • http://diwisowaf.rf.gd/35970923796.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/82294613874.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/happy_christmas_gif.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_off0000e603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE603 5100 bytes
SHA-256: bd9e62c174ce414324b1717addb3cc73072ade8dc54d7abbde6d185e0ecd23cc
font_01_sfnt_off0000f748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF748 11232 bytes
SHA-256: c2e2378d38739675e3838b346e641ae3a6b3de3ca50f8c33600280e60ca50146

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