Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa953cd5d09233ae…

MALICIOUS

PDF

78.8 KB Created: 2021-03-02 07:33:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee37c78e547f3e85fdbc3072e14674bc SHA-1: 1f7df94bc18ac400407d76a105068f9dc5acbff5 SHA-256: fa953cd5d09233aecaf0758ae3129f95799931f88b5cc4f78fba1f44314a99ec
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, pointing to various PDF documents hosted on external domains. The primary URL, https://lozipotod.ru/wix?keyword=pickle+rick+jokes, suggests a potential lure or keyword stuffing tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these linked documents.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/wix?keyword=pickle+rick+jokes
    • https://cdn.sqhk.co/mogudekusab/kmicjgr/balloon_dog_toy_target.pdf
    • https://birivisixakaxe.weebly.com/uploads/1/3/4/6/134608058/4256778.pdf
    • http://gizapiretade.iblogger.org/60570107439.pdf
    • https://cdn.sqhk.co/rizijuwet/fjdAFja/mikijelubol.pdf
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/402015.pdf
    • http://mumolazesinidix.getenjoyment.net/periodic_table_worksheet_answers_define_a_family.pdf
    • https://cdn.sqhk.co/lolajelor/ggMiegf/call_of_mini_zombies_mod_apk_unlimited_money.pdf
    • https://cdn.sqhk.co/luwivimexu/djXgehj/vufofe.pdf
    • http://gagitevanonuti.mywebcommunity.org/english_writing_for_beginners_books.pdf
    • https://cdn.sqhk.co/rowazazapa/hftjepx/64662020903.pdf
    • https://wimukesogizat.weebly.com/uploads/1/3/4/6/134639197/natofabakejab.pdf
    • http://prosucre.pro/62927109737gvbzr.pdf
    • https://leditolovon.weebly.com/uploads/1/3/2/6/132682688/4adabb0ca0b2c4.pdf
    • http://baranaydin.org/wwe_smackdown_resultsyhtfn.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wolixebob.rf.gd/texavurodivoxar.pdf
    • http://satawakerexe.atwebpages.com/the_way_of_the_world_themes.pdf
    • 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_off0000fb17.bin
91d8f387601e957da57a1a019497fcd2465208b9c1b7abb11fd6d85d7e03d70c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB17 4724 bytes
font_01_sfnt_off00010b43.bin
6e9c37bf265b787be8bc7286a7acf7df2d4b9e04b9f27acf19f87e11653b862c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B43 10320 bytes