Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c0f9f4965e49c3…

MALICIOUS

PDF

76.9 KB Created: 2021-04-03 21:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5d8e5dfa2c29e41f97f41fba6ccff8ef SHA-1: b9720b6d9cd065822bf4c80f914207018862ec98 SHA-256: 39c0f9f4965e49c39cc65e7570257645afcc342c5406db9f021b566ef82af8cb
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://botokaw.ru/strik?utm_term=is+the+2019+nissan+frontier+reliable PDF link annotation
    • https://cdn.sqhk.co/sipebililofo/jfBgigg/kunuregor.pdfIn PDF document text
    • http://mosebuzixat.mywebcommunity.org/waxixofotejuvefu.pdfIn PDF document text
    • https://tunibedexorole.weebly.com/uploads/1/3/5/3/135350281/joninijome.pdfIn PDF document text
    • http://vonexalux.sportsontheweb.net/automatic_voltage_regulator_working_principle.pdfIn PDF document text
    • https://cdn.sqhk.co/pisomuma/figgjQB/ducks_in_a_row_squirrels.pdfIn PDF document text
    • http://xenalebosob.scienceontheweb.net/595733152.pdfIn PDF document text
    • https://mixojokujize.weebly.com/uploads/1/3/4/3/134387696/narigaj.pdfIn PDF document text
    • https://jumifusat.weebly.com/uploads/1/3/4/6/134629025/c8298148fecdd.pdfIn PDF document text
    • https://fatitabo.weebly.com/uploads/1/3/4/7/134757356/332aa5.pdfIn PDF document text
    • https://cdn.sqhk.co/kuxixixixi/cYRHjaG/customer_quarterly_business_review_template_ppt.pdfIn PDF document text
    • https://lupemofuxuxutuj.weebly.com/uploads/1/3/1/3/131383332/dapemitokogal-vawovogixof-wubatitesaxinej.pdfIn PDF document text
    • https://jurefuzosapob.weebly.com/uploads/1/3/4/9/134901670/7c25e0f47356de5.pdfIn PDF document text
    • https://cdn.sqhk.co/zimidenex/ohdpPja/77876813762.pdfIn PDF document text
    • https://likufuzojelawaf.weebly.com/uploads/1/3/5/2/135298946/84c20.pdfIn PDF document text
    • https://cdn.sqhk.co/turovonunido/gcaWD6C/7912387489.pdfIn PDF document text
    • https://dewapapowirise.weebly.com/uploads/1/3/1/4/131438248/22bc4fca3472d8.pdfIn PDF document text
    • https://worubagazew.weebly.com/uploads/1/3/4/6/134639575/vufil.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/wotodedaruzuk/49802186312.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/under_the_dome_season_3_episode_2_dailymotion.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/how_to_program_my_directv_remote_to_my_vizio_sound_bar.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/24297360591.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/33881033402.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_off0000ed24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED24 5412 bytes
SHA-256: 4ba54b0296595702b1907ed4cc408920d4b43843419e123b66d0911eb9a18724
font_01_sfnt_off0000ff82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF82 10932 bytes
SHA-256: a6e7cd8b16a8be09d257cf6e10373b3f8b6b89fd8250c3dd8c69223408c07a2e

Open this report in the interactive analyzer, or submit your own file for analysis.