Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c03cdafe56572fd…

MALICIOUS

PDF

76.7 KB Created: 2021-01-18 16:31:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 36219f0f971483e67594c86ffb8fd18b SHA-1: 94aebd43ba59557a6de10e7ff452f498002d9cb6 SHA-256: 5c03cdafe56572fd7facdc622e7a5c3697dcf75aa6e385e9b757df0a7ef14bce
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, including suspicious domains like trafftec.ru and weebly.com. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to potentially harmful content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafftec.ru/aws?utm_term=daru+badnaam+song+video++mp4 PDF link annotation
    • https://zukamukenipebo.weebly.com/uploads/1/3/1/3/131380388/3947068.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383699/normal_5f9a314238e24.pdfIn PDF document text
    • https://cdn.sqhk.co/sesijisova/dji2geT/download_battlelands_royale_mod_apk_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/5ihrXjh/animated_short_stories_for_preschoolers.pdfIn PDF document text
    • http://jukavoluv.iblogger.org/hot_wheels_game_free_windows_7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492593/normal_60027f53f1e26.pdfIn PDF document text
    • http://nobirejajatit.iblogger.org/deadpool_2_parents_guide_rating.pdfIn PDF document text
    • https://gujojiri.weebly.com/uploads/1/3/4/4/134434224/betudokerivatawap.pdfIn PDF document text
    • https://cdn.sqhk.co/mapexuze/ZriKSge/27884734980.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zezazemana.epizy.com/9907013634.pdfIn PDF document text
    • http://tikarere.epizy.com/frictional_force_experiment_lab_report.pdfIn PDF document text
    • http://kidogip.epizy.com/film_genres_list.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_off0000c7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C5 5536 bytes
SHA-256: 94802ae9ec18492d48fa0a24bf0f4b70aec52e295c5b3755e236eb0dd066a376
font_01_sfnt_off0000da8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8D 14424 bytes
SHA-256: 1e3176dcbfb7a819fc0c2c04a0d816af983e369bf28d6abddb1a6e7d00051ab0
font_02_sfnt_off00010852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10852 18552 bytes
SHA-256: 606a74e09cd0d3283087642d554e1c102de07459d4966349a50f00de7c9b0905

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