Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cac5cffa5bbdd82…

MALICIOUS

PDF

100.3 KB Created: 2021-04-05 02:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 672eaa007b8e7e19234073627b307581 SHA-1: e2e6bf430b17f9a85019f58652a5af53f376fee3 SHA-256: 4cac5cffa5bbdd825e76e152c7d583681178f8f8bb0a08ee87344da7f39dced6
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of an external URI pointing to 'vilenefex.ru' suggests the document is designed to redirect users to a potentially harmful site. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

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://vilenefex.ru/123?utm_term=joseph+coat+of+many+colors+template
    • https://cdn.sqhk.co/xugavizira/g0ioJiB/87245764773.pdf
    • http://mapenibo.scienceontheweb.net/741_operational_amplifier_datasheet.pdf
    • http://dulisakip.medianewsonline.com/29652332201.pdf
    • https://cdn.sqhk.co/movumatoz/KjejADO/collage_creator_app_free.pdf
    • https://cdn.sqhk.co/tovipovo/gjjjrYl/68726487356.pdf
    • https://cdn-cms.f-static.net/uploads/4482860/normal_601578c4c9707.pdf
    • https://cdn-cms.f-static.net/uploads/4422906/normal_5fe7422e54960.pdf
    • https://cdn-cms.f-static.net/uploads/4415530/normal_6043fe1967154.pdf
    • https://cdn.sqhk.co/kepozote/QMjcynC/simcity_buildit_epic_buildings_cooldown.pdf
    • http://wozilimesiz.mypressonline.com/87261270905.pdf
    • https://cdn.sqhk.co/jurugaguvedu/wMMhbii/cute_puppies_and_kittens_and_bunnies.pdf
    • https://cdn.sqhk.co/bikegola/j8NefGf/arabic_remix_ringtone_2018.pdf
    • https://static.s123-cdn-static.com/uploads/4454161/normal_5fe272ff9ebcd.pdf
    • http://basumoxivor.sportsontheweb.net/spice_and_wolf_anime_episodes.pdf
    • http://parovosi.mygamesonline.org/career_paths_law_book_2.pdf
    • https://cdn-cms.f-static.net/uploads/4464852/normal_604f7b6d70918.pdf
    • http://mizizufiku.mywebcommunity.org/what_does_comprehension_mean_in_reading.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0a3.bin
9bc7f8eeb4113510d51e4432e2f398ca40d411b13cdc077871e8193e5c7b3cd7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A3 34784 bytes
font_01_sfnt_off00014c20.bin
c1b0b2b9973d094765ff26e9fe47d41eb3da359832e3cd83dfa6546173e7219e
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C20 5348 bytes
font_02_sfnt_off00015e2e.bin
2f4e936f3584f578c909cb6acfe629e21fe7aa6bd04d19f382f1e2f412e3cf9a
pdf-font-stream PDF embedded font (sfnt) at offset 0x15E2E 11072 bytes