Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9926ae580935e48…

MALICIOUS

PDF

81.1 KB Created: 2021-03-16 20:10:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 39ba5f65789bf145ff1293c2b7880237 SHA-1: e8e8f278867741a125690da83542a2a5735745d7 SHA-256: d9926ae580935e485602b5b2de7b17a68163ae60cf53263e65254304d1a205de
222 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and a link farm. The presence of a download button lure and ClamAV detection further supports this. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dafemum.ru/strik?utm_term=dr+simeons+pounds+and+inches In PDF document text
    • https://cdn.sqhk.co/sirepajaku/rhcihgc/gikamomefagir.pdfIn PDF document text
    • http://segway-wheelchair.ru/utility_software2crpt.pdfIn PDF document text
    • https://cdn.sqhk.co/denirinodo/zgciegh/retro_time_pilot_arcade_machine.pdfIn PDF document text
    • https://cdn.sqhk.co/mobirewin/AvjfLgh/muxefanofivunawuvakomul.pdfIn PDF document text
    • http://rozel.ru/98860438906ojv7b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/89815ef1-2570-43fc-aabb-f313322db112/can_you_use_turtle_beach_xo_four_on_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e7a4b7e-9523-4b2c-820e-18955ec99820/free_1st_level_dd_adventures_5e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a294c57d-6d70-4569-bce1-4f4340868173/physical_science_grade_10_pacesetter_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c76203b-6de9-4ac4-9822-29fb9e1df80d/presto_dehydro_digital_food_dehydrator.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/35911624920.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/analytic_geometry_and_introduction_to_calculus.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/nudojavugapomazerobavaxa.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/kingdom_of_the_wicked_book_2_read_online.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/belief_system_crossword_answer.pdfIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_2ae8fcc31298483780f36488ac09449e.pdf?index=trueIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_063a64c12927476f933c1ecb0c516aa5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3229ae46-7a5b-4ae2-a389-7359739f1f48/heirs_of_the_founders_book_review.pdfIn PDF document text
    • https://s3.amazonaws.com/midipes/breast_cancer_treatment_guidelines_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/13767981352.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/plus_size_dresses_canada_formal.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/gelewu.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_off0000fd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3A 5280 bytes
SHA-256: 16b8ae8feef786fa83a9eb5f6c8fb7b70a4d65f64e25485ba57ebe6a24e7f8ea
font_01_sfnt_off00010f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F03 11364 bytes
SHA-256: 3c5f1b1b0f7ced6cf047cfd69fcbcad2b12e534a949d3d8d8cbf89b353f188f0