Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc31eaea0587938…

MALICIOUS

PDF

79.9 KB Created: 2021-03-15 10:05:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 475985b92ca6c2091713ead22e2484de SHA-1: e10154ae7f6fa93aa61fa339a79cac405ec3a014 SHA-256: 8cc31eaea0587938c3cccfdf32dc130e916330d93e13f3af78a9e1951be0331e
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URL that leads to a suspicious domain, likely intended to trick the user into downloading further malware or engaging in phishing. The document body is heavily obfuscated and appears to be junk data, but the presence of the external URI and the overall detection indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/award?keyword=pes+anserine+bursitis+patient+info+pdf
    • http://porn77.design/tazuximuncf88a.pdf
    • https://static.s123-cdn-static.com/uploads/4447466/normal_5ff2255ae0731.pdf
    • https://static.s123-cdn-static.com/uploads/4470040/normal_5fcf9fb50c7c8.pdf
    • https://static.s123-cdn-static.com/uploads/4366377/normal_5ffdf3bf017e5.pdf
    • http://zofanelo.22web.org/triangular_arbitrage_in_the_foreign_exchange_market.pdf
    • http://forsage.pw/928733558700uhnt.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fosagobomap/kenyan_passport_renewal_form.pdf
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_d7b0942efe3f4a84ae656c938b72a5a6.pdf?index=true
    • http://toxawilel.epizy.com/beauty_plus_premium_unlocked_apk.pdf
    • https://s3.amazonaws.com/pukiza/48897394649.pdf
    • https://uploads.strikinglycdn.com/files/0d9269cb-fbf2-4f8c-a1ea-b00224a93c38/63297217495.pdf
    • https://uploads.strikinglycdn.com/files/0e750c68-2dbf-4e9f-8ed7-0bf8b00972d4/93403913578.pdf
    • https://s3.amazonaws.com/kesumasaka/sopevijonemavali.pdf
    • http://piterar.epizy.com/kowapivodexem.pdf
    • https://s3.amazonaws.com/pusixa/95906425781.pdf
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_43fa01d353b347b5b8d2c1cf51d6003d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d31b3d20-1bda-4fcd-ac62-bd338c256ff2/mechanical_engineering_reference_manual_for_the_pe_exam.pdf
    • https://d0275d90-c5b4-4c72-b581-d0e2b62fc6dd.filesusr.com/ugd/ee54da_6e844b0ecc144530b784297626cf79a1.pdf?index=true
    • https://acd80754-3b70-42c6-a60f-3489f6261da4.filesusr.com/ugd/f1780b_01b91c6ebd5445fab23659ecb90c0781.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4f796ff4-cabe-4e9e-82af-3f15676f6492/how_to_start_writing_a_love_story_novel.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_off0000fa34.bin
d582a5aa0694d27d67be74e72a87422bb3472b96b425d1c010f654dcc3b5eee1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA34 5144 bytes
font_01_sfnt_off00010bbc.bin
af43ee48a7c85d4fd0f19c1a85964b887d1e71adc9d28877d210bb7d3b3ad102		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBC 11792 bytes

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