Malicious PDF — malware analysis report

Static analysis result for SHA-256 45427fbb857783bf…

MALICIOUS

PDF

89.5 KB Created: 2021-05-28 23:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3fccdd7e0e188fcf708e3b2ff0efad9b SHA-1: 4cf5ec54cab2594642dc68cc580f07ad5bb2249c SHA-256: 45427fbb857783bf63fbaf202eef039fc96b66635a334a4dfd6f6ad7173352fc
156 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a malicious phishing document, specifically flagged by ML classifiers and ClamAV. It includes an external URI pointing to a suspicious domain, vilenefex.ru, which is likely part of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to a photo editor application, aiming to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vilenefex.ru/123?utm_term=fabby+camera+and+photo+editor+apk
    • https://static.s123-cdn-static.com/uploads/4421472/normal_60091c7d6a634.pdf
    • https://vovopifibinurit.weebly.com/uploads/1/3/4/6/134654598/nujavokevo.pdf
    • https://nupewaxupojiga.weebly.com/uploads/1/3/4/0/134042887/8859c82.pdf
    • https://cdn-cms.f-static.net/uploads/4501634/normal_602ab9b2d38d4.pdf
    • https://cdn-cms.f-static.net/uploads/4365591/normal_606c5cd4af5a9.pdf
    • https://dajifavetesa.weebly.com/uploads/1/3/4/2/134234726/5528709.pdf
    • https://cdn-cms.f-static.net/uploads/4482402/normal_600e3968820f0.pdf
    • https://static.s123-cdn-static.com/uploads/4422640/normal_5fe49222b4778.pdf
    • https://static.s123-cdn-static.com/uploads/4447079/normal_5ff2369b7d124.pdf
    • https://cdn-cms.f-static.net/uploads/4403429/normal_604af222d70e4.pdf
    • https://fuzujaloxoz.weebly.com/uploads/1/3/4/6/134684853/5e66ced48b69048.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/34798088-c9bc-4af0-8978-d0d70183d568/vokatagonewiv.pdf
    • https://uploads.strikinglycdn.com/files/a6955205-da2d-4bde-a112-d5bc970af480/ge_profile_microwave_manual.pdf
    • https://uploads.strikinglycdn.com/files/91b0e339-60d7-4f5d-b7b3-cff2317f71e4/como_crear_documentos_gratis.pdf
    • https://uploads.strikinglycdn.com/files/9290d014-bda9-496c-b5a5-a22560cbd555/fobebutiz.pdf
    • https://uploads.strikinglycdn.com/files/e6e62904-2494-465a-9c10-8a29879c2bed/midetisolejabawefoka.pdf
    • https://uploads.strikinglycdn.com/files/219dfd76-201a-4114-a99e-2683796ee7a0/mijuzunomepadip.pdf
    • https://uploads.strikinglycdn.com/files/3160253d-ae78-4a7a-a016-819f4fd4f906/72065287476.pdf
    • https://uploads.strikinglycdn.com/files/c9395d2e-6b4e-488a-978d-2ad3f61186d7/desinerixese.pdf
    • https://uploads.strikinglycdn.com/files/8bc39383-c740-4687-9a52-765d3aa8613d/what_is_the_after_book_series_rated.pdf
    • https://uploads.strikinglycdn.com/files/56d2e9c9-3a44-45bd-9409-3b8980f66769/frozen_meals_that_are_gluten_free_and_dairy_free.pdf
    • https://uploads.strikinglycdn.com/files/6623bb87-c53a-4499-87d4-753de196394d/boxir.pdf
    • https://uploads.strikinglycdn.com/files/18dc5883-4acf-4ad2-8394-b73e5893eaf9/what_are_some_cool_girl_dog_names.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8e9.bin
705377623a4c4344e02470fedf876d1ed6f0c7c0eac322cafb15afc9430d14bf
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E9 6440 bytes
font_01_sfnt_off000108dd.bin
13f730ea8bc6a329d28c7dfc052f6836189670cc0b1e628b9b4390a06e0aa921
pdf-font-stream PDF embedded font (sfnt) at offset 0x108DD 5364 bytes
font_02_sfnt_off00011af5.bin
7ee7c89fe448253ae70100d547cfff96eb12ef769b35fe4c6c75fdbef347009b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF5 11320 bytes
font_03_sfnt_off0001419a.bin
7b1b3bf1e370e013263dd8decb4c04d141cb6a20cb83150cd82712e1af1baf4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1419A 16396 bytes