Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4fae38e0fc8be9d…

MALICIOUS

PDF

72.6 KB Created: 2020-12-20 03:20:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0795b7243694a514d45bcbc95c5e8472 SHA-1: 7795cf77a75674ac7b1bd289fb52036f41259a44 SHA-256: d4fae38e0fc8be9dc3a75f7b9389e3c11633043588da80d78ca32e04ae8cceb0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links, many hosted on Weebly, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, contains text related to 'Answers for proctorio exam', indicating a lure to trick users into clicking malicious links.

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-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://trafftec.ru/strik?utm_term=answers+for+proctorio+exam
    • https://garaxawodipadi.weebly.com/uploads/1/3/4/5/134595678/rekudeles.pdf
    • https://rotarivinevi.weebly.com/uploads/1/3/4/5/134599250/tuzugaros.pdf
    • https://dapinolun.weebly.com/uploads/1/3/4/7/134762022/xebenoperix.pdf
    • https://mijelowiwiloz.weebly.com/uploads/1/3/1/1/131163856/2996277.pdf
    • https://mizitixas.weebly.com/uploads/1/3/4/5/134589849/a7836f.pdf
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/jitoluxezo.pdf
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/4094859.pdf
    • https://jopizogado.weebly.com/uploads/1/3/4/3/134317888/2e3d89712f.pdf
    • https://bakuwosir.weebly.com/uploads/1/3/0/8/130874569/vojunef-wevuluran.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/50dfbe64-f99e-45fe-9c43-8a564a80400c/partnership_dissolution_agreement.pdf
    • https://uploads.strikinglycdn.com/files/acef6e82-7ddf-457c-81ad-750bfbeabbfb/3_gs_restaurant.pdf
    • https://uploads.strikinglycdn.com/files/ff49b7f7-7683-485e-b786-0682682a2582/fun_unblocked_game_websites.pdf
    • https://uploads.strikinglycdn.com/files/18c03c8a-5f05-4de7-a1c4-e53f5832ee6d/78370668179.pdf
    • https://uploads.strikinglycdn.com/files/57cf4b02-eb8c-4326-be3c-0c480773f175/zigarutusitit.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2ac.bin
8c4c3ad785c24101bf87a4f8b3f3f7e4b2ff91ea27368baf8a255cfaddf28c09		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AC 5064 bytes
font_01_sfnt_off0000e3cf.bin
a80c5db2c5d8501f415633565b1ddee4b1b9a6854bf27c6fc19a99d7b0ad4293		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CF 10496 bytes
font_02_sfnt_off0001077f.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1077F 4324 bytes

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