Malicious PDF — malware analysis report

Static analysis result for SHA-256 c94386f46f687aa3…

MALICIOUS

PDF

80.3 KB Created: 2021-01-12 12:38:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8cc9f567405572420fb77eae661a66ae SHA-1: 0a688dacdb1bc52f1507ec3f1633ab5663a6f8d0 SHA-256: c94386f46f687aa3eecb3606141cd254ef97bb1368c032792347d50bc8f95644
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one specifically pointing to 'traffset.ru', suggesting it functions as a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffset.ru/aws?utm_term=limiting+reagent+questions+and+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446782/normal_5fa5f2b54946b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428045/normal_5ffca346c0b72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374957/normal_5febced7e36b2.pdfIn PDF document text
    • https://site-1173807.mozfiles.com/files/1173807/offline_pixel_art_color_by_number_games.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381094/normal_5f8b790c027e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373992/normal_5fe720fd8d100.pdfIn PDF document text
    • https://site-1173169.mozfiles.com/files/1173169/punjabi_status_love_video_download_sharechat_2020.pdfIn PDF document text
    • https://site-1223179.mozfiles.com/files/1223179/skin_maker_for_minecraft_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/kagelemovo/jiEigji/very_loud_alarm_clock_for_heavy_sleepers_uk.pdfIn PDF document text
    • https://site-1175125.mozfiles.com/files/1175125/steel_ball_run_anime_watch.pdfIn PDF document text
    • https://site-1171745.mozfiles.com/files/1171745/download_toca_train_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414488/normal_5fd1e66a2df73.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xomepixo/78427432377.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/formaggio_brie__grasso.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/feather_leather_earrings_template.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE722 5272 bytes
SHA-256: ae048c06687401115769b8b0e9846d3ebafc76f4ca75798d985275a6da7740f2
font_01_sfnt_off0000f8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FE 11092 bytes
SHA-256: 4318d6e3e2d49c4183916a5b0f7eec86fc4fe8d5b94139f81c53efcbde3e031b
font_02_sfnt_off00011efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFB 16096 bytes
SHA-256: 3bb08857b08983a257d5a2052628e18542fd51c8d29f5bbef87ea8b8ace00841

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