Malicious PDF — malware analysis report

Static analysis result for SHA-256 de3bc9af735e2d1a…

MALICIOUS

PDF

78.4 KB Created: 2021-03-16 00:29:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60ae572794a976248e253d86eef3c61a SHA-1: e8bc34aae5544591d2f667466c8220c46a1e8853 SHA-256: de3bc9af735e2d1ad0007f2f5b3570cb93c63c70c9a505a362437fcdfa187772
156 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating a large number of external links, suggesting a link farm or phishing attempt. The document body, though heavily corrupted, contains keywords related to a 'Toro self pace lawn mower manual' and 'wkhtmltopdf', indicating a lure. The presence of embedded URLs and the overall structure point towards a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/wix?keyword=toro+self+pace+lawn+mower+manual
    • http://getfreecreditreport.info/mesemey1evr.pdf
    • https://fojomuku.weebly.com/uploads/1/3/4/4/134447263/tojesilixubidir.pdf
    • http://xudisoda.66ghz.com/kroos_guide_idle_heroes.pdf
    • http://carinsusa.com/jirisabivaahfhg.pdf
    • http://uscovidcharts.com/how_to_test_a_schumacher_battery_chargerh2yae.pdf
    • http://redpandarecycling.com/asamblea_nacional_constituyente_colombia61jsr.pdf
    • http://gidigunorefe.iblogger.org/3645348714.pdf
    • https://sosuxivi.weebly.com/uploads/1/3/6/0/136056733/zodugifi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3175e58c-9db9-4d87-bcb9-15e03531d93d.filesusr.com/ugd/c93210_eb8e273c87ba42fc92f03ef6afb4bb8d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5dda5dc9-d358-486e-b3c0-ba595a9b07d3/947857417.pdf
    • https://uploads.strikinglycdn.com/files/4b050aaf-140c-4af9-bc4b-e89e99f75942/brewmaster_monk_dual_wield_shadowlands.pdf
    • https://uploads.strikinglycdn.com/files/ee454eca-3952-456c-b092-51e03441aa56/arbys_tartar_sauce_calories.pdf
    • https://5b3500e9-40b4-440a-9ada-171ed8bcf4c9.filesusr.com/ugd/7820d0_ac7282dd37d94367aee15ed3763e8079.pdf?index=true
    • http://didigenekogama.epizy.com/fledgling_octavia_butler_themes.pdf
    • https://uploads.strikinglycdn.com/files/d4c0972b-e4f8-43c6-bab0-4db47b9c4d86/55886820486.pdf
    • https://uploads.strikinglycdn.com/files/ec91aa31-1cda-45fe-bce8-8d51da60a534/56379751976.pdf
    • https://uploads.strikinglycdn.com/files/2dd9c39f-bab8-488a-bf9e-ac0ad1ade637/fapuzowekele.pdf
    • https://uploads.strikinglycdn.com/files/fe33fa15-142a-45d1-af13-76e1102155a2/gogurefisujixoje.pdf
    • http://tafobinememen.epizy.com/35805089129.pdf
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_4f8d7223893b4bd6a976027eff444312.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ab213803-6a6d-4d17-873c-61f2731e9a66/fidivawawa.pdf
    • https://uploads.strikinglycdn.com/files/4194eae4-2335-43ce-890e-8f2b2a52cae5/keyboard_layout_elite_dangerous_profile.pdf
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_daf6e5efe3564a009a9f64fbe73d6c89.pdf?index=true
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f48d.bin
2da03c91007ecebce4ccafbd9b7edd67d4139ed849d840a3982ae99ea8661029		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF48D 5200 bytes
font_01_sfnt_off0001063f.bin
058bcfc427fffd637c6a767f81ae402353cb6b7322f8b76adddeeb591d71ff62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1063F 11060 bytes

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