Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1af69fbf792b454…

MALICIOUS

PDF

66.0 KB Created: 2021-03-30 22:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0604ee491275ff4c809860f171a1bbde SHA-1: 40af359b67b0f302d10abd0307286eb3de2903ef SHA-256: e1af69fbf792b4549626b000f08984f18c8769bb97dcdfbe8af133819b4338e2
96 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating the presence of external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to an 'Apttp study guide'. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://xajibur.ru/wix?keyword=apttp+study+guide
    • http://wimazufeb.iblogger.org/17814610873.pdf
    • https://cdn.sqhk.co/fiduzosi/ygdijoA/jebebesinelefewiredun.pdf
    • http://sujabupinoda.scienceontheweb.net/what_is_the_average_price_of_a_trampoline.pdf
    • https://cdn.sqhk.co/tegatiwuwax/UKjpmMW/76744270853.pdf
    • https://zevofukuje.weebly.com/uploads/1/3/4/5/134585027/58a8d32f5f8a7fd.pdf
    • https://gegirugotosizuk.weebly.com/uploads/1/3/5/3/135397722/3acb4a1de0.pdf
    • https://cdn.sqhk.co/kikolibub/tRcuigd/the_conquest_colonization_game_risk.pdf
    • https://webuwoterin.weebly.com/uploads/1/3/4/5/134589655/9f822bbae.pdf
    • http://rupazaduxil.mywebcommunity.org/gowarugunuf.pdf
    • http://ruvegesa.iblogger.org/26117861084.pdf
    • https://latezuletarok.weebly.com/uploads/1/3/5/2/135298634/3393031.pdf
    • http://rawiduti.medianewsonline.com/18311014407.pdf
    • https://fezagexagowib.weebly.com/uploads/1/3/5/3/135313062/mefol-nifetabatogi-kuzirujux.pdf
    • http://napowojeba.medianewsonline.com/49073349585.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mubemutolewe/lowoguliw.pdf
    • https://uploads.strikinglycdn.com/files/47af314f-02f5-4611-bbae-3cd0ce25e044/how_to_create_ecommerce_website_in_wordpress_free.pdf
    • https://uploads.strikinglycdn.com/files/11dd977b-a348-46be-b46b-90a082423956/95230794001.pdf
    • http://miwodiseraxi.rf.gd/laferevajaveke.pdf
    • http://fegedenem.rf.gd/catholic_communion_service_guidelines.pdf
    • https://s3.amazonaws.com/kalanejaxutilif/accu_chek_performa_battery_replacement.pdf
    • https://uploads.strikinglycdn.com/files/5d1a828b-7c33-498c-87f9-e3015589b597/what_is_an_engineering_drawing.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_off0000c6c5.bin
9ceb022213d63784a1b5cb5293680383a35d5064f8f9a42c68708586c1a36a08
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C5 4880 bytes
font_01_sfnt_off0000d783.bin
d22bddca8ca0f10b6845132457c08d8e295ccd4b2888425b06cd6526072371bd
pdf-font-stream PDF embedded font (sfnt) at offset 0xD783 10400 bytes