Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f74d6b23cfb697f…

MALICIOUS

PDF

71.7 KB Created: 2021-02-02 13:08:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4dc422b2597ffec69f032e12333d4151 SHA-1: 7f2a6afb8ef244dffa51192b0bd8a9c677fe6b77 SHA-256: 7f74d6b23cfb697f4d14a7f75c08517ca17c2c5a1eb7dd35bf0525a9b59126d6
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to reference technical documentation, suggesting a lure to trick users into visiting these malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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.
  • 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://yafferge.ru/aws?utm_term=krohne+electromagnetic+flow+meter+datasheet In PDF document text
    • https://dirukarizudabi.weebly.com/uploads/1/3/2/3/132303081/retegojaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427519/normal_5feb7f04bc27d.pdfIn PDF document text
    • https://bufujibuku.weebly.com/uploads/1/3/4/8/134862056/zizopudezafujara.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449419/normal_6018f898a14c4.pdfIn PDF document text
    • https://xeraxoxatetubus.weebly.com/uploads/1/3/5/9/135993523/7823194.pdfIn PDF document text
    • http://nobirejajatit.iblogger.org/mcdonalds_apple_pie_box_template.pdfIn PDF document text
    • https://cdn.sqhk.co/suwezuzifu/ShihakB/playstation_direct_restock_11_13.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500201/normal_5feb47e567d06.pdfIn PDF document text
    • https://diniporugixufov.weebly.com/uploads/1/3/1/8/131856235/nevuviju.pdfIn PDF document text
    • https://tesurupijirixu.weebly.com/uploads/1/3/0/8/130813669/vojepaxopazebono.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pibunowawoxi.epizy.com/how_to_fix_sheetrock_corner_cracks.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/99243474911.pdfIn PDF document text
    • http://pibowaloboko.rf.gd/abdel_halim_hafez_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/vibinupejeta.pdfIn PDF document text
    • http://kilubediboxut.rf.gd/uyir_the_soul_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/chickies_and_petes_nutrition_information.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F6 5496 bytes
SHA-256: 07ea54e5327ed20371316fad2e499bc76930d5bf463d665a2cb983f9ede5c43d
font_01_sfnt_off0000d595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD595 11192 bytes
SHA-256: f7f732f5d3d4fa559f985c6ef93f40c6611c76041de52ea62780599c49da21c0
font_02_sfnt_off0000fbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFF 16224 bytes
SHA-256: 626584da6b333d4016a6548fe2c7d8126a65ccd8e4d02cee332161341a4b9fef

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