Malicious PDF — malware analysis report

Static analysis result for SHA-256 b39b5b940142c1a6…

MALICIOUS

PDF

79.6 KB Created: 2021-03-30 19:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: bdd201e32bbd482c6f4578997afcc5a8 SHA-1: 5c3059facdf7ee4d755b3f72a2b87ed0a3c0a81e SHA-256: b39b5b940142c1a64ffd1fee14453d16fdf2937aa7a368cd80b9f61ba46e0d04
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with a primary focus on a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to a movie summary, designed to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://xezojetit.ru/strik?utm_term=boy+in+the+striped+pajamas+summary+movie PDF link annotation
    • http://temilops.xyz/wafonipo22t1e.pdfIn PDF document text
    • http://waragofekoxexaz.sportsontheweb.net/bph_diagnosis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388037/normal_60328fbc3851a.pdfIn PDF document text
    • http://mainsale.info/27050928551n1yg7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467322/normal_601245dc01893.pdfIn PDF document text
    • http://pemufosapakem.mypressonline.com/geteripusurok.pdfIn PDF document text
    • http://instapriz365.site/voguvumigedevu41ost.pdfIn PDF document text
    • https://bufazori.weebly.com/uploads/1/3/4/3/134377245/a7debcc043.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489730/normal_5fd3a2953d51f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379610/normal_5feb0a54caa29.pdfIn PDF document text
    • http://classkaod.ru/5369840459347ohh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413564/normal_5ff3fea740804.pdfIn PDF document text
    • http://figuxovutofid.mygamesonline.org/68046212595.pdfIn PDF document text
    • http://future-techno.ru/rukadidefazuja6dzf8.pdfIn PDF document text
    • https://fulerisigimigo.weebly.com/uploads/1/3/4/5/134586495/kefuvujuw_fidevojofilun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kapowuxivi.atwebpages.com/lijaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddd459cb-dfb1-474f-94b0-cca8659285de/65295472725.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edc08e67-cbf8-4a7e-ad5d-16580194290d/nursery_short_stories_in_malayalam.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/dezitoxejotezonalut.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/guvipodurizanepewamax.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/healthy_foods_printable_coloring_sheets.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_off0000f722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF722 5456 bytes
SHA-256: 135e10fa8ef2a43545881bd792bd036fcca3eb371ce9b016efb594b43efa6617
font_01_sfnt_off0001099b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099B 11668 bytes
SHA-256: 71ce6c6280a808706e44c34f116acc5d0f325e6210c10f54a376aab02e92d6aa

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