Malicious PDF — malware analysis report

Static analysis result for SHA-256 411f74a67fc0852c…

MALICIOUS

PDF

82.5 KB Created: 2021-03-29 01:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 231fd7cbfd206fd3bb2fe6bf1700f550 SHA-1: 2fa20a1edb787af3c60b1255cfa9a1fcd83f5737 SHA-256: 411f74a67fc0852c3279ddae3cc71965ae0a89d49c72dc4aa1611ea8df22dd6f
126 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs, many of which point to disposable hosting or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a common phishing lure, likely designed to redirect users to malicious sites.

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://fokemale.ru/award?keyword=tratamiento+anemia+de+celulas+falciformes+pdf PDF link annotation
    • https://cdn.sqhk.co/bofotabi/Tjiebib/ethyl_chloroformate_reaction_with_water.pdfIn PDF document text
    • http://wupofifaxixusi.66ghz.com/84761158642.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413243/normal_601cff913e09a.pdfIn PDF document text
    • http://xifemimuxudita.22web.org/bimedezir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369920/normal_605941ee1fb8a.pdfIn PDF document text
    • http://filopibat.22web.org/jerexolugifon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376856/normal_600364fef1842.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486745/normal_6051300458a8a.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/ctmZjfP/skater_skirt_outfits_for_night_out.pdfIn PDF document text
    • https://cdn.sqhk.co/nawafoxobok/jclFgif/81757787768.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/rezugekolaba/16844464140.pdfIn PDF document text
    • http://todifotitidowos.epizy.com/18746432792.pdfIn PDF document text
    • https://s3.amazonaws.com/kegovev/are_citronella_bark_collars_effective.pdfIn PDF document text
    • http://jofesosozofoso.epizy.com/android_high_graphics_games.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/what_was_the_first_form_of_government_in_greece.pdfIn PDF document text
    • http://bemuvubovewe.epizy.com/what_are_some_problems_with_the_american_education_system.pdfIn PDF document text
    • http://pisironebininuw.rf.gd/how_heavy_is_a_round_bale_of_straw.pdfIn PDF document text
    • http://momewitu.epizy.com/80206390856.pdfIn PDF document text
    • http://tasibufoz.rf.gd/shenzhen_electronics_market_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/forazegawati.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/daterangepicker_display_format.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
    • https://medlineplus.gov/spanish/sicklecelldisease.htmlIn 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_off000102a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A7 5248 bytes
SHA-256: 3202cabe77066115c534bc11decefa5acb244dabf879622f66cf67309dff9618
font_01_sfnt_off0001146b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146B 11960 bytes
SHA-256: 4480cf066c436c6b7101caf208610ed3c2fbd98052f6a743914bbb4bd983d310

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