Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58c4dce0624396e…

MALICIOUS

PDF

85.6 KB Created: 2021-02-28 16:00:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d290f5059c50b92113949f7601ffd9f5 SHA-1: e209b898a022e11f041c29b803f59d434c5cf6d5 SHA-256: a58c4dce0624396e733fe36430be40adc9b6149f06ea9344fffa83e752f90d43
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of a URL with a 'utm_term' parameter indicates a potential phishing lure or a mechanism to track user engagement with the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/123?utm_term=jvc+kd-r461+protecting+send+service
    • https://cdn-cms.f-static.net/uploads/4476268/normal_602ffaafdd9fd.pdf
    • https://gawofatofuwe.weebly.com/uploads/1/3/1/3/131380275/nurimo.pdf
    • https://cdn-cms.f-static.net/uploads/4443602/normal_6030df987efe4.pdf
    • https://giruwaferelesed.weebly.com/uploads/1/3/4/8/134850821/sofas-nepodudovemi-pigusadol-romun.pdf
    • https://static.s123-cdn-static.com/uploads/4416672/normal_5fffaee4f06d7.pdf
    • https://static.s123-cdn-static.com/uploads/4366319/normal_5fca12354850b.pdf
    • http://kosodidaxelo.22web.org/meaning_of_socio-_economic_development.pdf
    • https://retowukiri.weebly.com/uploads/1/3/4/5/134592720/zamelobujuluv.pdf
    • https://wisetigu.weebly.com/uploads/1/3/4/3/134357320/6650011.pdf
    • http://7evenrp.ru/chicken_broth_gone_bad5np8g.pdf
    • http://a1metromovers.com/icd_9_code_for_septicemia_shockndh3n.pdf
    • http://zootime.store/learn_english_vocabulary_book7n0my.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fezenur/proforma_invoice_gst_in_excel.pdf
    • https://s3.amazonaws.com/dotivaf/nogobosemetizi.pdf
    • http://laletanegimiw.epizy.com/are_automatic_or_manual_cars_cheaper.pdf
    • http://xekababemaxukop.rf.gd/red_blue_3d_video_converter_free.pdf
    • https://s3.amazonaws.com/mosezavor/biforme_definition_francais.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eca3.bin
dc29fb428df11d01fea38c75cd7a2dbddc8f706e1327dcaecc5978e97c06af8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECA3 5440 bytes
font_01_sfnt_off0000ff49.bin
6df76f85352cfd85eb85b0e6b369c28fccba3a14cdc791aa4f2a93fd4639c33e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF49 4376 bytes
font_02_sfnt_off00010bcc.bin
9ceacfa0295558cccfcc2ec3154307cfa3f4c30f7580ed7a1f365648e15f55fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCC 11184 bytes
font_03_sfnt_off000131e5.bin
3afbc95f4a2677bf4c8b77bd7df62e4dbeb651db4b5e482cf97b58e472170d58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131E5 16164 bytes

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