Malicious PDF — malware analysis report

Static analysis result for SHA-256 8615fbdd38a8e60f…

MALICIOUS

PDF

75.4 KB Created: 2021-05-22 22:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5bfc9b1fa6bce2853a741d690522a2c0 SHA-1: fbbe2990a1fc06b0c387e3eaa47689d1e9e419a4 SHA-256: 8615fbdd38a8e60f1a8d6382e3ad69bcda2154cd558a5e44db88bc929719d747
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used to redirect users to malicious websites for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=how+to+calculate+superheat+and+subcooling+410a
    • https://nulivuxod.weebly.com/uploads/1/3/0/7/130776854/f5e421.pdf
    • https://wuvumivew.weebly.com/uploads/1/3/1/4/131410662/16d5bb8a.pdf
    • https://cdn-cms.f-static.net/uploads/4426677/normal_602dc56fd4f2c.pdf
    • https://static.s123-cdn-static.com/uploads/4491157/normal_5fe567b550685.pdf
    • https://pepotojil.weebly.com/uploads/1/3/4/9/134900045/4522367.pdf
    • https://bemofoserobonuw.weebly.com/uploads/1/3/0/7/130739893/wifudos-forizutizus.pdf
    • https://cdn-cms.f-static.net/uploads/4460682/normal_604a53099411b.pdf
    • https://kumevilowe.weebly.com/uploads/1/3/4/5/134598600/4c5d8b59198b.pdf
    • https://wokonupojelofa.weebly.com/uploads/1/3/5/3/135351156/jijenunitisosaf.pdf
    • https://pimazapodozem.weebly.com/uploads/1/3/2/8/132814260/5995747.pdf
    • https://manoduxasef.weebly.com/uploads/1/3/4/0/134041035/f1cec9e5.pdf
    • https://jagusidenoz.weebly.com/uploads/1/3/4/9/134902343/kuweg_zomupasu_zebakej_tululavozo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/305f2b15-1801-4151-a6e5-59799c8ed8e5/the_subtle_knife_release_date.pdf
    • https://uploads.strikinglycdn.com/files/18f31327-cd46-414e-be82-a2545c811898/fender_mustang_lt_25_manuale_italiano.pdf
    • https://s3.amazonaws.com/kefefetafij/tuvefuti.pdf
    • https://s3.amazonaws.com/nijudow/vezoxixixowedal.pdf
    • https://s3.amazonaws.com/selivuvumepaveb/kaxivuf.pdf
    • https://s3.amazonaws.com/minegikukovel/steam_size_increasing.pdf
    • https://s3.amazonaws.com/kefefetafij/89693949665.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_off0000e693.bin
b5562b3b04425e716af426eb7e7f35b099b0191f78822af9ff4ebc4dd1108470		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE693 5812 bytes
font_01_sfnt_off0000fa6e.bin
afb9d1b3ab7d2898d13939aecbec3d41b428e6cc2eb09aba15e67994c4fe4f3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6E 11148 bytes

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