Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f6bcf4734f4b2b…

MALICIOUS

PDF

75.6 KB Created: 2021-03-24 05:30:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1ce486cead65868999ce7d5b769c623a SHA-1: d948aee927c1f758b758fa932946923a42a8fa76 SHA-256: 16f6bcf4734f4b2b7a57fb3cc9ff431d96a1aa0d5a31991a887519569890b2bc
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains and potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. The document body, though heavily obfuscated, suggests a lure related to 'worksheet answers', which is a common tactic for phishing or SEO spam. The presence of external URIs and link farms strongly suggests an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/wix?keyword=grace+and+redemption+in+film+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/pakebisas/lUheZjd/fuxumizexes.pdfIn PDF document text
    • http://requiredjokblog.com/2819279328973wmr.pdfIn PDF document text
    • http://scrlt.xyz/gokubzt868.pdfIn PDF document text
    • https://gogovujogizog.weebly.com/uploads/1/3/1/6/131607278/fonetupuwig.pdfIn PDF document text
    • http://laserisesiseno.getenjoyment.net/kamubaxako.pdfIn PDF document text
    • http://confirmyourverifiedbadge.com/a_farewell_to_arms_review_new_york_timesla3xi.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/Dvidgjl/android_nougat_32_bit.pdfIn PDF document text
    • https://cdn.sqhk.co/bepoweruga/jZshbia/concha_ice_cream_sandwich_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/xorilulog/jdhfhc9/10767666499.pdfIn PDF document text
    • https://kojemugolipoxo.weebly.com/uploads/1/3/4/7/134729864/mutoguvoxami.pdfIn PDF document text
    • http://leafester.online/mastering_arnold_renderer_for_cinema_4dcxisj.pdfIn PDF document text
    • http://hurleyshamburgers.com/75570799074qpkq7.pdfIn PDF document text
    • http://francobusiness.com/rebirthing_skillet_ninjagomc4jb.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/dubiditiginowo/fagejerogexi.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/dot_plots_and_histograms_practice_worksheet.pdfIn PDF document text
    • http://lixugafepujijoj.onlinewebshop.net/what_is_network_planning_in_project_management.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/how_much_is_the_dyson_v8_at_costco.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_off0000e965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE965 5584 bytes
SHA-256: c8f6bd5e78f8f4c73493a511343ae30ef96b4a729da5bf14d1632cf907458bed
font_01_sfnt_off0000fc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4B 10216 bytes
SHA-256: ab1313a042e08a8fb04661730f9e3e212726e383cf7ab0844bdd0549611d2cdf

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