Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a368b3141bdc8c…

MALICIOUS

PDF

85.9 KB Created: 2021-05-03 23:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d69ec701d1f05c547ad41d891293ce3 SHA-1: 29e66cf2202c74716d1e574c01660797c0f18b29 SHA-256: f9a368b3141bdc8cdb31db0d20d4fe16994e08bcc841b49a44c6cba39385f096
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicated maliciousness. The heuristics suggest this PDF acts as a link farm, directing users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • 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 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://kuzutuzo.ru/strik?utm_term=samsung+rs261mdrs+ice+maker+replacement
    • http://giocodigital.space/cuanto_es_5_10_pies_en_metrosp9p55.pdf
    • http://belldiscount.ru/944315073022dsia.pdf
    • http://picsonair.com/mutuladujekipimhww1p.pdf
    • http://torchland.xyz/vetadinupozexeredizakubuxflqmn.pdf
    • http://zuxemesemubozo.mywebcommunity.org/critical_analysis_definition.pdf
    • http://lalikexitaxixix.getenjoyment.net/metal_gear_2_nes.pdf
    • http://wenatal.getenjoyment.net/reduce_file_size_below_300_kb_online.pdf
    • https://dabusoze.weebly.com/uploads/1/3/4/5/134585091/fozebize_rovirusakuva_jitovorexir_nulegululipem.pdf
    • http://sodalabs.club/scala_rider_g9x_manual_portuguesgyb64.pdf
    • http://mebelrostov.ru/what_wifi_extender_works_with_verizon_fios921c4.pdf
    • http://prizinsta365.website/deroxomarazu6zbh4.pdf
    • https://telumenodizoxop.weebly.com/uploads/1/3/4/2/134266327/268335.pdf
    • https://cdn.sqhk.co/rifojimuna/4hcibb1/8165937768.pdf
    • http://detonic-shop.website/grbl_1._1_pinout_arduino_nanoqc3zy.pdf
    • https://cdn.sqhk.co/fofateze/haB21ha/wolfychu_real_face.pdf
    • http://mobeditobaxul.scienceontheweb.net/2007_ford_explorer_repair_manual.pdf
    • https://nonufovoda.weebly.com/uploads/1/3/0/7/130775853/8525661.pdf
    • http://hookup668.site/70108182104iwjqb.pdf
    • https://pavuxutekukos.weebly.com/uploads/1/3/4/7/134704216/lawakusa.pdf
    • https://cdn.sqhk.co/kusewupudin/3idggij/23006117611.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jatoxat.atwebpages.com/questionnaire_on_social_media_marketing.pdf
    • https://e9155d39-0f7d-4366-9ee8-34e17fe3d773.filesusr.com/ugd/9e05b8_7f0fef8214d54c60877adbd65c03b027.pdf?index=true
    • https://7a1f2a0d-094a-4466-88af-72a4af93b9fa.filesusr.com/ugd/22739b_8b6e1f84c96d4524962cf9f31e55fb2b.pdf?index=true
    • https://f3b86e06-b3aa-4ee1-82f7-79049f3379a8.filesusr.com/ugd/0c4fd2_a5089da9558a4067bc9e034f4f801c77.pdf?index=true
    • https://d046670e-94b8-4ea2-8efc-69fca9b502c9.filesusr.com/ugd/c0b427_d72efc097d314c2eaaedbb221430aac7.pdf?index=true
    • https://3796e7af-74f6-4269-b4b1-c98d6d9a2df3.filesusr.com/ugd/169b5e_3896d7758f184575980a265eefa8fea5.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_off000112a0.bin
23aa415326c2079dc8cacc27358f1a40f4d5b283d59e62aa04d4e17a2e2cb470		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112A0 5896 bytes
font_01_sfnt_off000126a2.bin
311d70cfac34f66211cdd798e6891c65f04026c73167e17ce23bbef405a348f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126A2 10200 bytes

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