Malicious PDF — malware analysis report

Static analysis result for SHA-256 55cdfa70180cd8ba…

MALICIOUS

PDF

74.5 KB Created: 2021-04-05 21:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f772071a2e04d8f1718163faecb1d759 SHA-1: dff706ff84538243ec19e888d9ad60693a4ceaeb SHA-256: 55cdfa70180cd8baee87d47f8294942776665fa7e0c2496a07d74c8ac40cffd2
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains an embedded URL pointing to 'soxebez.ru', which is likely used to deliver a secondary payload or conduct phishing. The document body, though heavily obfuscated, suggests a lure related to a 'periodic table pic hd'. No scripts were extracted, but the PDF structure itself facilitated the embedding of the malicious URI.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://soxebez.ru/123?utm_term=periodic+table+pic+hd
    • https://cdn-cms.f-static.net/uploads/4427293/normal_603ccd1d3ef58.pdf
    • https://cdn.sqhk.co/zozusexub/iaIEjbf/top_grossing_sports_apparel_companies.pdf
    • https://cdn.sqhk.co/pomorezolo/hhjchf9/vitamin_b12_foods_vegetables.pdf
    • https://cdn-cms.f-static.net/uploads/4387031/normal_60214875efc88.pdf
    • https://cdn-cms.f-static.net/uploads/4385413/normal_5fdb1fb472096.pdf
    • https://cdn-cms.f-static.net/uploads/4421207/normal_601e21eb2b467.pdf
    • https://cdn-cms.f-static.net/uploads/4484359/normal_6060b8106e9f7.pdf
    • https://cdn.sqhk.co/turanexode/jja05ii/gejopaxanubumekemuvoxofos.pdf
    • https://cdn-cms.f-static.net/uploads/4427544/normal_602c7756d12b4.pdf
    • https://cdn.sqhk.co/vesagivara/X6jcoii/songs_for_mystic_messenger_day_4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c1785508-3b82-4cc4-9baa-44ec80d43aa7/kulewada.pdf
    • https://s3.amazonaws.com/vufupu/capsa_susun_mod_apk_indoplay.pdf
    • https://uploads.strikinglycdn.com/files/71646dd5-3d40-46c2-830b-45a8b7271e44/dinodosedi.pdf
    • https://uploads.strikinglycdn.com/files/fdf78423-4ba7-4d48-b0af-9298161e8bc5/puwavuwitibolele.pdf
    • https://s3.amazonaws.com/fuwenoxuzasila/how_to_change_water_filter_in_kenmore_coldspot_refrigerator.pdf
    • https://s3.amazonaws.com/fajeloninesitel/bofolovofinananok.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_off0000e4e6.bin
6619e8f22bb183fc1a27c758adc89e672c7ec3f5afb7d38898a760c62cacb05c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E6 5124 bytes
font_01_sfnt_off0000f640.bin
4f1b340132978b7a25eace3570b7b67bda69895ee0190a98c2d21e9558b96dc1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF640 11068 bytes