Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8403a1d758b8fab…

MALICIOUS

PDF

79.3 KB Created: 2021-01-25 19:49:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0ca8379c8592cddeaeebeb6a76d08154 SHA-1: 465b72359f6c96e622beafa7acaded495d0fc1cd SHA-256: b8403a1d758b8fab5f1b6a2a1f426567d32c957665364c3ca748a1cf9d4d21d3
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains numerous embedded URLs, many of which are hosted on disposable domains or link farms, suggesting a phishing or malware distribution scheme. The presence of 'free games for pc' in the document body and URLs points towards a lure to trick users into downloading unwanted or malicious software.

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=free++games+for+pc+8+ball PDF link annotation
    • https://cdn.sqhk.co/mozulunilex/jiizjam/drift_legends_hack_ios_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzutuse/biixgfo/towevuzujafaposive.pdfIn PDF document text
    • http://prod-fruit.space/whatsapp_status_saver_for_iphone_6sygc9c.pdfIn PDF document text
    • https://xirovule.weebly.com/uploads/1/3/4/7/134749068/55696.pdfIn PDF document text
    • https://rijagadufe.weebly.com/uploads/1/3/1/6/131606992/879280.pdfIn PDF document text
    • http://groshyk.site/67599786402232hd.pdfIn PDF document text
    • https://cdn.sqhk.co/tesinogopano/ZR6hhib/rc_helicopter_for_sale_ebay.pdfIn PDF document text
    • http://danivufulof.iblogger.org/moradog.pdfIn PDF document text
    • http://zaralutodunuwa.66ghz.com/40930013383.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mixonanax.epizy.com/civ_5_how_to_use_guided_missile.pdfIn PDF document text
    • http://suwetiwojiza.rf.gd/puwinuvezisulafavexijode.pdfIn PDF document text
    • http://batogegimuwew.rf.gd/buderus_termostat_rc35_manual.pdfIn PDF document text
    • http://galikamot.epizy.com/vidmate_app_in_apkpure.pdfIn PDF document text
    • http://talakukatutevib.epizy.com/battlefield_1_mobile.pdfIn PDF document text
    • http://nupakavidowux.epizy.com/naval_war_games_pc_free.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF811 5624 bytes
SHA-256: 7b3c5b54b9702d8c299196c38c54913a7127efa17390954dce059cc89d5c3a1a
font_01_sfnt_off00010b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1F 10816 bytes
SHA-256: 3419fa99928510ad7cbe768cfe0519a81ec1202200ee75c6105bbbfe12f386ba

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