Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2d1dfcfeb5b9152…

MALICIOUS

PDF

74.7 KB Created: 2021-03-27 19:42:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4593ca20d9e18aed601fa7af0e6c71d2 SHA-1: 143c37247c5d273ebf93a86f0445c610559c2418 SHA-256: d2d1dfcfeb5b91529c7e0cb5de8dbdfbd5672e3dee85b6675d3c44d2cd80ddfe
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to deliver a malicious payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to an 'answers key'. No scripts were extracted, but the presence of external URIs and the ML/AV detections strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/wix?keyword=the+fish+kill+mystery+answers+key
    • https://cdn.sqhk.co/lagazowasobo/mJgjJIr/broken_hearted_girl_lyrics.pdf
    • http://steelsho1.club/what_is_the_literal_and_figurative_meaning_of_soledads_fever3i2mg.pdf
    • http://wirelessinfo.ru/buvor1mvrv.pdf
    • http://semengergel.ru/wefodaviluwukovqa2xz.pdf
    • http://scandisvet.ru/rowenta_steamer_reviews5u30c.pdf
    • http://leopards.space/184123838985h6g7.pdf
    • https://cdn-cms.f-static.net/uploads/4481831/normal_60295df073edc.pdf
    • https://static.s123-cdn-static.com/uploads/4376105/normal_5fca9fe28a526.pdf
    • http://indonesia2health.online/do_movies_get_removed_from_amazon_primemspv9.pdf
    • http://milanomoda.site/5311485034358lo3.pdf
    • http://siankaanmexico.com/sword_art_online_game_pcutjos.pdf
    • http://smartcoin.design/80s_music_hits_ukwh6xe.pdf
    • https://cdn-cms.f-static.net/uploads/4412606/normal_60393a15a65c6.pdf
    • https://cdn.sqhk.co/jigixomavola/jcxFibz/74885511891.pdf
    • http://fashion-deals.xyz/what_does_nearest_10_meanfvvrz.pdf
    • https://cdn.sqhk.co/puvegipuros/JrFhcGn/gorelomexawevaxuwumomi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_cfe8b7c8e7b149ed82cfc331bfc6b60c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3c4276cf-bc9b-460d-bffa-6c675a162b7a/jalamizasosa.pdf
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_6c7fd8dd2de34ef99752672edf7d2108.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a8033217-b834-4ce6-9270-9cfd28cf0678/14791846310.pdf
    • https://uploads.strikinglycdn.com/files/e1a4dce8-748b-4287-a1f1-5731e25063a9/matlab_2019b_mac_os_download.pdf
    • https://uploads.strikinglycdn.com/files/7d878b78-9261-4521-8670-aa280ee218c8/how_to_fix_a_water_softener_motor.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_off0000e575.bin
0fe603d8234181f2c2e332b73dbe3622f71263b3562b7b4b4904a27b37650a51		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE575 5216 bytes
font_01_sfnt_off0000f719.bin
a7d13f190138540eed3fe346f7fdbf3a92ec13ca8fbd847aed4828eed718611b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF719 11484 bytes

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