Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e7b8a76dfc794c6…

MALICIOUS

PDF

78.1 KB Created: 2021-06-11 21:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 398633666f7a164286164feb9d1bd5c4 SHA-1: b3ed8cd9ac22f00b76b63f2d281fff5279ee79fb SHA-256: 5e7b8a76dfc794c6bc484ff7b1279d10ce7036799f5bc91c2ccc90f350f83101
202 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ML classifier and ClamAV detection. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains text related to a 'Trade up csgo calculator' and application metadata, which may serve as a lure. The presence of numerous external links indicates an attempt to redirect the user to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 8

  • 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 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://garglob.ru/pbw?utm_term=trade+up+csgo+calculator PDF link annotation
    • https://tasidumil.weebly.com/uploads/1/3/2/6/132680907/40524.pdfIn PDF document text
    • https://lubumona.weebly.com/uploads/1/3/4/6/134648672/6382031.pdfIn PDF document text
    • https://rovagurepuj.weebly.com/uploads/1/3/1/8/131856033/5157676.pdfIn PDF document text
    • https://letosuve.weebly.com/uploads/1/3/0/7/130739520/4946353.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tosixuze.pbworks.com/f/alice_in_wonderland_read_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab4a5e7b-1dea-45c4-bd6d-cf546649181c/20878578889.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d742b4a-2904-4e06-adcf-2b4f2c65f42a/how_to_add_image_google_search.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/944841ab-2ee9-44ce-8576-8b6cd02047a3/where_can_i_repair_my_g_shock_watch.pdfIn PDF document text
    • http://poxanoralanu.pbworks.com/w/file/fetch/144681411/4762738534.pdfIn PDF document text
    • http://vatezerajigo.pbworks.com/f/jekhane_bhooter_bhoy_torrent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bc2f7b1-c86d-45f4-bb50-6f07fcc5580c/17554192620.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9902e70b-5da2-4355-83be-04e2a8af26ff/98548709152.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73fc5c67-8114-49f1-b349-40a65ac59888/freelance_writer_monthly_income.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b7e6052-7ef8-41de-893e-b4ac04709f06/the_art_of_racing_in_the_rain_cast.pdfIn PDF document text
    • http://visetululiv.pbworks.com/f/how_is_tax_calculated_on_a_private_limited_company.pdfIn PDF document text
    • http://niwomif.pbworks.com/f/how_to_journalize_accrued_salaries.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a8bfd7b-b763-41e4-8e27-05527b0e19d9/35014609048.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18b29b70-666b-4d4d-963d-09423943d91c/2706050252.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/122d894a-94f8-4762-a6b9-f62c168fe846/how_to_start_a_coal_stove_with_charcoal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/543ddd35-c835-4fb3-9d46-9e2590864094/what_is_the_chemical_name_for_sea_salt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcded889-1a32-4ac6-8b84-b139ad180e8c/2013_dodge_avenger_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0e0afc7-6a88-4ac1-888a-694179f3ebf2/kitchenaid_artisan_mixer_black_friday_kohls.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d858816d-8b1e-433b-af53-8cebee8b8950/samsung_nu7100_service_manual.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_off0000f3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B5 5192 bytes
SHA-256: f20e8b2840011a1213288a0de789acdf86aefd5bfb04457282293c62fa27f7a7
font_01_sfnt_off00010569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10569 11320 bytes
SHA-256: ea0cb4a767d4d7e448cf8932bacf72a6b71601a712043c01a44a88a40d7f99c0

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