Malicious PDF — malware analysis report

Static analysis result for SHA-256 d87cc30127f8570b…

MALICIOUS

PDF

74.6 KB Created: 2021-03-02 18:07:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34e86a3bda4a2c6053c28263dfc94edb SHA-1: cebcc6f48be12771628586e4a1cb6f0cd5ed87f4 SHA-256: d87cc30127f8570b156b8c0fb3c073e14cb0979f5432456ddc50a31cd10face0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as book-related content, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/strik?utm_term=scorch+trials+book
    • https://sovufejado.weebly.com/uploads/1/3/0/7/130740048/d046bfd77b7c87.pdf
    • https://static.s123-cdn-static.com/uploads/4367311/normal_5ff64f704643b.pdf
    • https://fegajasun.weebly.com/uploads/1/3/4/5/134502742/gibuxivudasuvaxezuk.pdf
    • https://static.s123-cdn-static.com/uploads/4369930/normal_6007240833d43.pdf
    • https://static.s123-cdn-static.com/uploads/4388283/normal_5ff89367db693.pdf
    • https://static.s123-cdn-static.com/uploads/4421360/normal_5fe447955fdae.pdf
    • https://puwelivaju.weebly.com/uploads/1/3/4/8/134885893/pokoju.pdf
    • https://jagunafine.weebly.com/uploads/1/3/4/3/134363358/mebuf.pdf
    • https://vopuxobud.weebly.com/uploads/1/3/5/9/135974080/72cf767e61f42f9.pdf
    • https://cdn-cms.f-static.net/uploads/4418391/normal_6036f2025efc7.pdf
    • http://saganofodevuset.22web.org/8798638860.pdf
    • https://cdn-cms.f-static.net/uploads/4387226/normal_60242b4cc4a98.pdf
    • https://cdn-cms.f-static.net/uploads/4445114/normal_601340531869b.pdf
    • https://static.s123-cdn-static.com/uploads/4392442/normal_5fef18605d77a.pdf
    • https://sotumeramevoma.weebly.com/uploads/1/3/0/9/130969712/tatirupikuwala.pdf
    • http://kojovud.iblogger.org/tidosupafa.pdf
    • https://gobadinemi.weebly.com/uploads/1/3/5/2/135299992/7911898.pdf
    • https://kukavijeri.weebly.com/uploads/1/3/3/9/133997324/jofetajuke_putanit_vinozoravoj_wazudiwujasugex.pdf
    • https://lezekuzog.weebly.com/uploads/1/3/1/3/131378913/2437131.pdf
    • https://nedetuvozuwe.weebly.com/uploads/1/3/4/6/134699612/5532016.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lofuwup.rf.gd/ielts_reading_practice_test_12_answers.pdf
    • http://kipinoda.rf.gd/mubuvikawabaxokorivunov.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8c9.bin
da9e8f16bba76c604287d2499139277156e48c202f3b5ceca75870f4c9c04106		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C9 5196 bytes
font_01_sfnt_off0000fa6b.bin
cc2360e7f7b6297338fab98a1b18d643de482959bc40c5c5a4e07978008f96f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6B 10228 bytes

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