Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d11bd17b856b3c5…

MALICIOUS

PDF

72.1 KB Created: 2021-03-23 01:36:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6c68707f0c6fa2b7d7f0682b94512ee SHA-1: d1a05a345701908660455e35e414dee95be060fd SHA-256: 9d11bd17b856b3c514e926c8eb5e05b233ec0b5c69780688754950409a49481a
156 Risk Score

Malware Insights

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

The PDF file contains a link farm of external PDF documents, masquerading as a "pdf to word converter". The presence of numerous external links and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malicious content distribution scheme. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=pdf+to+word+converter+offline+setup+download
    • https://cdn-cms.f-static.net/uploads/4369912/normal_6012801155b82.pdf
    • http://widonatozeg.mypressonline.com/kezudugatuzu.pdf
    • http://tafuxasomup.getenjoyment.net/can_flavored_condoms_cause_uti.pdf
    • https://cdn-cms.f-static.net/uploads/4443619/normal_604b1c8355e07.pdf
    • https://static.s123-cdn-static.com/uploads/4445337/normal_5ff2bbfccf889.pdf
    • http://fijexojor.getenjoyment.net/how_to_support_sagging_floor_joists.pdf
    • https://static.s123-cdn-static.com/uploads/4456985/normal_5ffa02606df0b.pdf
    • https://cdn-cms.f-static.net/uploads/4405641/normal_601b53cff1ef2.pdf
    • https://cdn-cms.f-static.net/uploads/4448103/normal_6024fe637f4bf.pdf
    • https://cdn-cms.f-static.net/uploads/4412899/normal_5fd5f04cdf084.pdf
    • https://nufewaxitobazat.weebly.com/uploads/1/3/4/7/134748461/sagagejomom-wojidexakeku-bupebawefa-mulotimuwigupel.pdf
    • https://kikafizujugu.weebly.com/uploads/1/3/4/0/134012642/3477484.pdf
    • http://mevesepegubisis.scienceontheweb.net/cambios_fisicos_psicologicos_y_emocionales_en_la_adolescencia.pdf
    • https://static.s123-cdn-static.com/uploads/4496571/normal_5ffe4c698113e.pdf
    • https://cdn-cms.f-static.net/uploads/4427295/normal_601ca915e9819.pdf
    • https://static.s123-cdn-static.com/uploads/4382639/normal_5fdd972c7ce22.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gazinuxifo.epizy.com/batna_and_zopa.pdf
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_fb0c51d7bfd54fe8b88fc21e4073c1ae.pdf?index=true
    • http://jodamedorofile.epizy.com/bisupi.pdf
    • http://rigidafavubo.myartsonline.com/5807790508.pdf
    • https://3465328d-eb21-4af5-a94e-b8fdacefaafa.filesusr.com/ugd/c63bf9_e30e684ffd75454183666b1e051a1102.pdf?index=true
    • https://983c8978-ad56-435f-a988-47358aa6040c.filesusr.com/ugd/06a663_4085c1e0ee8446a1a11ac746fb1b34ed.pdf?index=true
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_92712be2141443039ef5a89accfa417f.pdf?index=true
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc7c.bin
e643166d107589f12c7ed5d72d7b70cf86100e1b79d463aaee5f6b6b73900017		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7C 5304 bytes
font_01_sfnt_off0000eeb1.bin
1dab939f351ab7425cdeb8f68b6fc7461b2404c86a0e6febc276fc8e7a9690b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB1 10628 bytes

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