Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb2265d7ff2eee28…

MALICIOUS

PDF

86.9 KB Created: 2021-02-22 22:41:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9b91e5b92fb911fa2324abc9c21a5c51 SHA-1: 1bc0be18449993140cf8f08683e5cfa077638016 SHA-256: fb2265d7ff2eee28e34f87b14c1048159fa950ef28dfc74d5c31eb5ca3b0cd14
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

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
  • 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://baarspo.ru/strik?utm_term=i+spy+with+my+little+eye+rap+song+lyrics PDF link annotation
    • http://shishkin-seed.xyz/73919760129ykf12.pdfIn PDF document text
    • http://xaxikobovivo.22web.org/39390980347.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378404/normal_60218873ef7ae.pdfIn PDF document text
    • http://onenature.space/xigizosnnp3q.pdfIn PDF document text
    • http://vostokzapad.su/35003453809u12jb.pdfIn PDF document text
    • https://cdn.sqhk.co/someteku/wqgdVgd/73568618620.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375357/normal_6011b7827d63c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416805/normal_5fe5b72b6d561.pdfIn PDF document text
    • https://jigurojo.weebly.com/uploads/1/3/5/3/135321607/129909a969.pdfIn PDF document text
    • http://idealica-ordina.site/canzoniere_liturgico_con_accordih2770.pdfIn PDF document text
    • http://samelike.site/subtypes_of_antisocial_behavior_questionnaireb861z.pdfIn PDF document text
    • https://cdn.sqhk.co/gogerazina/icORCgh/vatomir.pdfIn PDF document text
    • http://kreativoblako.com/163867003783ctx5.pdfIn PDF document text
    • http://betflixguvenilirmi.com/fluke_microscanner2_manual_deutschbu7rw.pdfIn PDF document text
    • http://vsspb.ru/bounce_original_dryer_sheetsxzxzq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392470/normal_5ff9e6df4e13e.pdfIn PDF document text
    • https://cdn.sqhk.co/jutigurotow/SqsVRhg/movogenir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pixawobizazixe.rf.gd/jokakesawotimarexamafim.pdfIn PDF document text
    • http://rifukaleriduji.rf.gd/45134878252.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_off00011568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11568 5476 bytes
SHA-256: 961b13fe7bc104704a49fed257f03756f724ada6f2d30666615c1f1c5c83270e
font_01_sfnt_off000127f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F9 11280 bytes
SHA-256: 3f3a183338ac103c0a380095c5b74fc4f9edeb4283a05ac87fc031e6ecdf6ce2

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