Malicious PDF — malware analysis report

Static analysis result for SHA-256 f31f64fc0e13ce8f…

MALICIOUS

PDF

86.2 KB Created: 2021-04-06 06:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8ff9bc462b151db2497888e93e4f7661 SHA-1: 71dd9166935f60ff3738e636bf7cf3cea14280a7 SHA-256: f31f64fc0e13ce8f9761d184898a0d31597e1cf201a79b6c9ad78555cf8d6406
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this, indicating the PDF's structure is optimized for SEO to attract users seeking specific documents, which are then likely used for phishing or malware delivery.

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://resalured.ru/award?keyword=acetil+l+carnitina+pdf PDF link annotation
    • http://websporizlehd.com/this_is_gospel_piano_sheet_with_lyricsviybq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495271/normal_602c897555c03.pdfIn PDF document text
    • http://pavozuketogo.mygamesonline.org/biodiversity_conservation_and_management.pdfIn PDF document text
    • http://munasimowijuxi.getenjoyment.net/hp_elitebook_2760p_core_i7_price_in_bangladesh.pdfIn PDF document text
    • http://yesitalia.fun/lutuxinoxibakokonufagipesvw5xk.pdfIn PDF document text
    • http://revershjtb.site/what_are_osi_protocolsksty5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426551/normal_6029c38f15ab8.pdfIn PDF document text
    • https://cdn.sqhk.co/latosagax/tfjephj/66457360217.pdfIn PDF document text
    • https://cdn.sqhk.co/lewiwifo/ghmvjcZ/saputejupivorezub.pdfIn PDF document text
    • http://lenugaguv.medianewsonline.com/mimefi.pdfIn PDF document text
    • http://leziwazedo.mypressonline.com/apc_smart_ups_1000_not_turning_on.pdfIn PDF document text
    • https://cdn.sqhk.co/tozegatopaxu/Xjfidjh/rutevizuruba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490523/normal_60000c2b2d0e2.pdfIn PDF document text
    • https://cdn.sqhk.co/jiguluzufuwa/jeha5pn/red_swordfish_breeding.pdfIn PDF document text
    • http://coolstudent.space/masotilolopejosupikodigd3qe0.pdfIn PDF document text
    • https://cdn.sqhk.co/wifinalimow/h1pohcO/download_volume_booster_program.pdfIn PDF document text
    • http://secret-empire.ru/nubosajobk20qk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453718/normal_5ff70a0951eea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445107/normal_5ff3f09d409fc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://batapijas.myartsonline.com/folanifo.pdfIn PDF document text
    • http://netomadutimafe.onlinewebshop.net/reproduction_in_chlamydomonas.pdfIn PDF document text
    • http://xobibaga.myartsonline.com/gejomonimakivofe.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_off000114a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A9 4960 bytes
SHA-256: de63ea7871c23e7201981463939ef97f52b83d3bd6fec57ce6561f87e95e6f6d
font_01_sfnt_off0001259f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259F 11568 bytes
SHA-256: 1082f7b91ff1e87b0a704243005d2ac5621f68e7a069652595528a3bc491810a

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