Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c7d91f402611bd…

MALICIOUS

PDF

82.9 KB Created: 2021-03-17 18:47:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd27e3601476e33361f7688e899b3312 SHA-1: 89250d1016c187eac293b4384b1a4c06252cd2d1 SHA-256: c1c7d91f402611bd16a575fef5a687b394480f848f0e5c220bd6d957a7892592
96 Risk Score

Malware Insights

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

The PDF document is classified as malicious by ML and ClamAV, and contains an embedded URI pointing to a suspicious domain. The document body, though heavily obfuscated, suggests a lure related to 'Physics 101 lab manual answers', indicating a phishing or malware distribution attempt. The presence of multiple unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://zajinet.ru/wix?keyword=physics+101+lab+manual+answers
    • http://wabaxifejem.sportsontheweb.net/2067627851.pdf
    • https://rusokupos.weebly.com/uploads/1/3/4/4/134468665/3501081.pdf
    • https://wifadesar.weebly.com/uploads/1/3/5/3/135345928/e981c648350.pdf
    • https://femovoba.weebly.com/uploads/1/3/0/7/130775826/tilezokusewirulib.pdf
    • https://fudegenajeno.weebly.com/uploads/1/3/4/5/134581691/sugoki.pdf
    • https://gokaveruziniva.weebly.com/uploads/1/3/4/5/134580144/b9a7f565a.pdf
    • http://mizejodaf.mywebcommunity.org/dyson_v6_absolute_cordless_vacuum_cleaner_problems.pdf
    • http://budofibo.mygamesonline.org/physical_properties_of_alkyl_halides.pdf
    • https://masezinonorokun.weebly.com/uploads/1/3/4/6/134685416/gukafaw-punurasa.pdf
    • http://pifovabu.getenjoyment.net/47954441289.pdf
    • https://gujowidupisume.weebly.com/uploads/1/3/4/1/134131448/wejulisevuzenarux.pdf
    • http://nitapida.mywebcommunity.org/75260201819.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wulibazosuxib.onlinewebshop.net/septa_48_bus_schedule_saturday.pdf
    • https://uploads.strikinglycdn.com/files/41d1805f-5ff3-4b0a-9eee-6180bc4bae5f/what_is_the_power_of_words.pdf
    • https://s3.amazonaws.com/murudute/17440828741.pdf
    • http://fuvuvadut.onlinewebshop.net/40510636694.pdf
    • https://uploads.strikinglycdn.com/files/b6d599eb-f4aa-4d4c-b70f-a25c3ed55ff9/weber_grill_grates_spirit.pdf
    • https://uploads.strikinglycdn.com/files/401c30b2-ee04-44a0-b037-24c65b205675/50305777138.pdf
    • http://fuluxewamotate.atwebpages.com/64672427647.pdf
    • https://uploads.strikinglycdn.com/files/862633d6-b0bb-46fb-bff7-516b02394e8d/how_to_fix_a_cracked_vitamix.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_off000103e4.bin
0320fca62524175787924f26602685d56e01bcb92101873283810140d3047100
pdf-font-stream PDF embedded font (sfnt) at offset 0x103E4 5568 bytes
font_01_sfnt_off000116c4.bin
f8a797ed25797faaf847b2e434c3432dbdd0009aecfc70364c148148233dd65f
pdf-font-stream PDF embedded font (sfnt) at offset 0x116C4 11740 bytes