Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b0735f4060a077…

MALICIOUS

PDF

95.2 KB Created: 2021-04-13 15:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5cd60f54986f97cf8fb6ffce3628fb5d SHA-1: 204d20d6136497a255e159acc66cd74ad3cc04b1 SHA-256: a3b0735f4060a0771d734ac04c31125ab09f1f673d5adbf6a8ee952a0e678d23
156 Risk Score

Malware Insights

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

The PDF contains a heuristic indicating it is part of a link farm, with numerous external links, one of which is a potential phishing URL. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or a trojan. Although no scripts were explicitly extracted, the PDF structure and external links point towards a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jacksth.ru/strik?utm_term=how+many+marks+to+pass+theory+test+uk
    • https://zidereromozuj.weebly.com/uploads/1/3/4/6/134602294/sajogirasatimomeso.pdf
    • https://dukidisivaturan.weebly.com/uploads/1/3/5/3/135311912/4306392.pdf
    • https://lusugola.weebly.com/uploads/1/3/4/5/134599647/4039968.pdf
    • https://xakediripikevul.weebly.com/uploads/1/3/4/3/134338645/sijiraxiton.pdf
    • http://lupelisizi.medianewsonline.com/practical_skills_in_biology.pdf
    • http://somamorizeti.iblogger.org/xuradapus.pdf
    • http://trysol.xyz/48456331159vqvjt.pdf
    • https://degezumibupupek.weebly.com/uploads/1/3/4/8/134862322/fudixanosevigozoz.pdf
    • https://vizodejow.weebly.com/uploads/1/3/4/3/134356937/8795712.pdf
    • http://grenkasalo4.xyz/gididix8paf.pdf
    • http://reduslim-shop.website/pavanikelacqc6u.pdf
    • http://blaugrana.ru/12834605305v839p.pdf
    • http://shimano-stradic.ru/99859734925s9vgp.pdf
    • https://dexajaxalujum.weebly.com/uploads/1/3/1/8/131857565/kamumuboxipomal.pdf
    • http://ziposodepow.mywebcommunity.org/periodic_table_of_elements_black_and_white_printable.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nelekilegel.epizy.com/bidesajifebevotorokiwaro.pdf
    • https://s3.amazonaws.com/loneminovu/wisirixigiw.pdf
    • http://vaxusumimez.rf.gd/66771038038.pdf
    • https://s3.amazonaws.com/ligole/xbox_360_controller_driver_windows_7.pdf
    • https://s3.amazonaws.com/mudurixo/38792107937.pdf
    • https://s3.amazonaws.com/daselex/23913933462.pdf
    • http://vidavimutisov.epizy.com/lopapadazex.pdf
    • http://jetotajasavesi.atwebpages.com/33932839408.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_off0001340b.bin
a4860a37bb87b1193b335e9876544a4967b1b8b5062a0ef6f71338eb005c6d3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1340B 5244 bytes
font_01_sfnt_off000145c3.bin
7f71315ffeed798a467f539fa819bcd18845cead6a4cd345ced268e8a4e9aaf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x145C3 12312 bytes

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