Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc9a406ac12794ca…

MALICIOUS

PDF

81.0 KB Created: 2021-04-02 01:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb87ef668cdefeee06261e06711e3b0d SHA-1: 2bd6010df0eba4dc6a43030978fda033bc397df4 SHA-256: fc9a406ac12794cafe247984ad8cf9ef1f561cb73c647584636a66fd6298d977
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms and phishing lures. The heuristic 'PDF_SEO_LINK_FARM' indicates a high volume of outbound links, suggesting an attempt to drive traffic to malicious sites. ClamAV detection and ML classification confirm the malicious nature of the PDF, likely as a phishing or malware distribution vehicle.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/award?keyword=english+to+arabic+translation+words+pdf
    • http://douchehq.xyz/denasamabilabakatef994og.pdf
    • http://vuletotam.scienceontheweb.net/learn_hebrew_alphabet.pdf
    • http://pixell.store/fesoledegusezunabomavofomydfow.pdf
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdf
    • http://trokot-tonirovka.online/casio_aq-s800w-1evdf_erkek_kol_saatiwfxok.pdf
    • http://gamedv.design/14104656822485j6.pdf
    • http://tb-films.ru/ketaxoruvapajoh0umn.pdf
    • http://bcipreactivaperu.com/kexevomifabi2j3q6.pdf
    • http://spain50off.info/fire_and_ice_the_dragon_chronicles_full_movie_in_hindi_480pc98uk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://53860ffb-5975-4088-b838-5c82367c2827.filesusr.com/ugd/0d2908_0617cd5454bb4701867a150e297f7946.pdf?index=true
    • https://f6180879-d31b-499c-8e42-fead7842c491.filesusr.com/ugd/007227_3997072d62e149309b5b32c70aff2ad7.pdf?index=true
    • http://sefokirof.onlinewebshop.net/povutokub.pdf
    • https://8569cc17-8b2a-4187-ace0-95b0550b99f0.filesusr.com/ugd/d6eede_9bf2cc47896f41d4ab15e4fc85416cb9.pdf?index=true
    • https://25cf7bc6-226b-4013-96fa-c64d334b7dac.filesusr.com/ugd/317e1a_91e89b9f362d4e53a6fad2112c13ad80.pdf?index=true
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_4bf3725a8cd64e9abedb3bc514745f8d.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdf1.bin
dbb35b63b920a756fdf177a77fc014c52b36bb64c6f4e99cacbed485e4b97d15
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF1 5608 bytes
font_01_sfnt_off00011111.bin
38c328fbbf89bf9f008a9ac12af9c065bbbac01255eeb102b6783896af6f384d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11111 11352 bytes