Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6b5625ca6eff5ab…

MALICIOUS

PDF

71.5 KB Created: 2021-02-20 23:17:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 75d8bbb3902886bc831faf2f7abc40a3 SHA-1: 35ade4cced45d5e553375d4e3a6957f05e347b03 SHA-256: c6b5625ca6eff5abdfd6afbb0582af399c7188738402e2c764d56ecc19d35ed8
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics, including ML and ClamAV, as malicious. It contains numerous embedded URLs pointing to potentially malicious domains, with one specific URL identified as a link farm. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic strongly suggest an intent to redirect users to malicious websites, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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
  • 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://maypoin.ru/wix?keyword=hayas+o+hallas PDF link annotation
    • https://babixedijifaz.weebly.com/uploads/1/3/5/3/135385025/tokorutumekon.pdfIn PDF document text
    • http://volosaty100.xyz/super_mario_bros_2_game_boy_advance_walkthroughsb2ez.pdfIn PDF document text
    • https://cdn.sqhk.co/fovuxugo/jc5J3jj/car_light_color_changer_simulator.pdfIn PDF document text
    • http://complerbnp.com/play_super_smash_bros_64_online8qanz.pdfIn PDF document text
    • http://winsbig.space/samsung_j500f_combination_file_free9fs0b.pdfIn PDF document text
    • http://ruroraratotu.66ghz.com/4261471908.pdfIn PDF document text
    • https://cdn.sqhk.co/lilodipu/jfV5wha/clark_griswold_christmas_shirts.pdfIn PDF document text
    • http://copyrightnotices-form.com/misixuxulanislfdum.pdfIn PDF document text
    • http://fitoxis.22web.org/the_cakemaker_2017.pdfIn PDF document text
    • http://rollernefritmassage.xyz/97137591757l62pz.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/ajbhbje/48679395832.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/jugobimuraje/night_sky_app_for_android.pdfIn PDF document text
    • http://rozevilamires.rf.gd/antimicrobial_activity_of_azadirachta_indica.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/different_methods_of_teaching_social_studies.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/44731201321.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_off0000dbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAF 4740 bytes
SHA-256: 641853420728707b850f24534ca038854398009f7c14d78642745bffd84ca086
font_01_sfnt_off0000ebd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD1 11648 bytes
SHA-256: 42e91cdaf6622dec3e5069f27d1e5e10aceb20a65bac233079dc9c23ec935db4

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