Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ab98c472370033a…

MALICIOUS

PDF

69.8 KB Created: 2021-03-13 14:57:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 4646a9d5067fb6d19a1748927f62808e SHA-1: 5f55cd02fa3a8823c486a9a8c3966cb405820eef SHA-256: 5ab98c472370033a84d53ee35a662fc28fbde9019d9f1fd92d16d218613a3a6a
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to serve as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://midufefew.ru/wix?keyword=kill+shot+bravo+free+gold PDF link annotation
    • http://birebap.scienceontheweb.net/2010_town_and_country.pdfIn PDF document text
    • https://cdn.sqhk.co/nobixapo/jibXbhd/86139071945.pdfIn PDF document text
    • https://cdn.sqhk.co/fabetojowuje/eMgiMie/xuwofujetej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426062/normal_5fd3b11219d08.pdfIn PDF document text
    • https://cdn.sqhk.co/lajawawinu/eieFjh6/51729761312.pdfIn PDF document text
    • http://fobativ.mywebcommunity.org/32567005265.pdfIn PDF document text
    • https://cdn.sqhk.co/pulobegefuzi/gfMidkS/58470397823.pdfIn PDF document text
    • https://xabetidadema.weebly.com/uploads/1/3/1/3/131398123/mibejuwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387031/normal_601c6a1b411d5.pdfIn PDF document text
    • https://gerugufudob.weebly.com/uploads/1/3/4/8/134869234/2315593.pdfIn PDF document text
    • http://jerunuju.mypressonline.com/renagizebejunam.pdfIn PDF document text
    • https://cdn.sqhk.co/xugufufifo/hpQgihf/35611644170.pdfIn PDF document text
    • http://puwexakibo.iblogger.org/android_aes_encryption_sample_code.pdfIn PDF document text
    • http://giwewigipebi.medianewsonline.com/number_of_american_bases_in_germany.pdfIn PDF document text
    • http://xiwakaravivomik.scienceontheweb.net/11332257066.pdfIn PDF document text
    • https://nifatukipukixe.weebly.com/uploads/1/3/1/3/131398430/2685bea6.pdfIn PDF document text
    • http://bikupiribofaz.iblogger.org/linapizixuveb.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/falufusu/987593974.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/17366290851.pdfIn PDF document text
    • http://xesovukefezusag.rf.gd/setorufagas.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/delta_36-725_replacement_parts.pdfIn PDF document text
    • http://falivodekolulo.epizy.com/90686284533.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/15224425524.pdfIn PDF document text
    • http://bujozedaworora.epizy.com/kezaxaposun.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/ambedkar_images_free.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_off0000d4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EA 5340 bytes
SHA-256: 306e324d89230ca747237eae9128ee6dc3378a74f99a2e3ff7f2478b30e8843a
font_01_sfnt_off0000e717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE717 10084 bytes
SHA-256: bfc766099890bddf34b3a57355913d4c5592cdfc04e8a8fa6fccedeb7a5589e4

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