Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81c20b5a0e339e6…

MALICIOUS

PDF

91.0 KB Created: 2021-05-07 08:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c90859fcb79036ae2d3f7b50aae2e60 SHA-1: 21490e5cd45cce20bde38a3c2a837d901b2c974b SHA-256: f81c20b5a0e339e6b297f540534d89c1673dda05c7d6f4712a4f445c999db15a
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to a suspicious domain, likely intended for phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to a 'wiki' page, reinforcing the phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://seumenha.ru/strik?utm_term=nora+roberts+year+one+wiki
    • https://jukejifoka.weebly.com/uploads/1/3/5/3/135311866/mewodujuvemajo_siwafibi.pdf
    • https://cdn-cms.f-static.net/uploads/4415304/normal_6032ad81b4864.pdf
    • https://cdn-cms.f-static.net/uploads/4366312/normal_5fe762b099511.pdf
    • https://bipozoxadedisaj.weebly.com/uploads/1/3/1/1/131164124/legaka.pdf
    • https://cdn.sqhk.co/toledexipez/gf3rs8B/id90_travel_hotel_purchase.pdf
    • https://cdn.sqhk.co/zarejesorufo/cvziicf/void_tyrant_guide.pdf
    • https://pegepigav.weebly.com/uploads/1/3/4/4/134481067/pefazavoluze.pdf
    • https://cdn-cms.f-static.net/uploads/4455642/normal_60608642e6583.pdf
    • https://cdn-cms.f-static.net/uploads/4379029/normal_60182eec629a8.pdf
    • http://wutopezogegusi.getenjoyment.net/dogesana.pdf
    • http://letabumo.getenjoyment.net/busbar_protection.pdf
    • https://belexikezetuvom.weebly.com/uploads/1/3/0/7/130775063/463787.pdf
    • https://static.s123-cdn-static.com/uploads/4383929/normal_6004addb7f75d.pdf
    • https://pofifeluvoka.weebly.com/uploads/1/3/0/7/130739131/guxigigepusa.pdf
    • https://cdn.sqhk.co/leruwexikud/gifjfRR/dajizojusak.pdf
    • https://cdn.sqhk.co/wifinalimow/gijggcz/76017149027.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a0f2a958-801b-474f-8d39-7bcbb6e69a83/96768537568.pdf
    • https://s3.amazonaws.com/jiwisi/chicken_gyro_meat_nutrition_information.pdf
    • http://vakogez.myartsonline.com/19107739393.pdf
    • https://uploads.strikinglycdn.com/files/69574c42-269c-4b6a-8a6b-77932325bb4b/those_who_waited_on_the_lord.pdf
    • https://s3.amazonaws.com/tojabixefova/16419491389.pdf
    • https://uploads.strikinglycdn.com/files/1accd104-4080-466e-871a-72dfa9f1c995/what_is_the_hunger_games_catching_fire_book_about.pdf
    • https://s3.amazonaws.com/serogajugomiji/how_to_make_a_secret_door_in_a_bookcase.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_off000126ba.bin
53453f127d6f9950a166352a573b97cfb07b46c384a1d84a3eea414fcb8e128a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126BA 5012 bytes
font_01_sfnt_off000137f3.bin
5e9294660ce8121913fbe5b6cbef29e3e6de590693c54e1bed8e8406ff535797		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137F3 11480 bytes

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