Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad6b9c239f89b928…

MALICIOUS

PDF

162.7 KB Created: 2020-12-22 08:53:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 21563cb93fb4b02fef0de018ba4e5cb7 SHA-1: b2e1912a768cafc97e6a23abf561d96bae7a3981 SHA-256: ad6b9c239f89b928a46265d5a26ca3d3646ceb72dc0a4f8416e0429415ae4e0c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://trafffe.ru/123?utm_term=bleach+filler+arc+summary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367273/normal_5f8c537f374c2.pdfIn PDF document text
    • https://guxuxexor.weebly.com/uploads/1/3/0/7/130775085/9018140.pdfIn PDF document text
    • https://fuzakeraza.weebly.com/uploads/1/3/4/8/134848422/e1a0e3f.pdfIn PDF document text
    • https://sapafusazefo.weebly.com/uploads/1/3/4/4/134496158/2919480.pdfIn PDF document text
    • https://munelexogetajax.weebly.com/uploads/1/3/1/4/131437313/pibakibedotar.pdfIn PDF document text
    • https://pegugigatusib.weebly.com/uploads/1/3/4/4/134460290/wapupet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/452f9a2e-99ad-470e-a504-1267e3cfeccc/kikenewarukemaseti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24a559bb-f860-4f28-9808-0c60c109fda3/cute_january_2020_calendar.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/basazutexunugufolowiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff1dcd15-6d62-4faa-a6ce-0a29d2919321/ap_physics_textbook_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/xinexoxawus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d7e02b8-7a68-4021-98b9-de44733197f2/edd_form_de_2525.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cda39625-bee4-4336-a890-d9007a1f2a34/prior_lake_high_school_supply_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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001c066.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1C066 30324 bytes
SHA-256: 77666770dc7fb3209d157529c5ec81fefa587e3a294698529ef382a6a47bced5
font_01_sfnt_off00021fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21FE6 4856 bytes
SHA-256: e5be46ce1b6094c979cb9635e392102ea58773483ef09fa92063bb6b8ee51c73
font_02_sfnt_off0002306a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2306A 11988 bytes
SHA-256: 2e8ee72423687ce06c456390e2091afeae6de2b1df84d7c9200600cf866f7aea
font_03_sfnt_off00025800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25800 16132 bytes
SHA-256: 895f66822cee8096b629ba52ebdbe333aa959cf625638ac8af8884b25f69792f
font_04_sfnt_off00026cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26CF2 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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