Malicious PDF — malware analysis report

Static analysis result for SHA-256 816f6a733cd5ca38…

MALICIOUS

PDF

72.8 KB Created: 2021-06-07 04:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6fe15bd8cdde38f3659b03cd997ae10c SHA-1: b62ae2b14f83748e37839540ee478568242cb130 SHA-256: 816f6a733cd5ca3840702c0ef80c211328efd3ddabc100192183fc09b752fab9
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 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/pbw?utm_term=voiced+and+voiceless+sounds+in+english PDF link annotation
    • https://wigubidukes.weebly.com/uploads/1/3/1/6/131606651/d0133ef9aeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386095/normal_6060df4225be2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404293/normal_5ffd3122769d0.pdfIn PDF document text
    • https://fijozemubo.weebly.com/uploads/1/3/4/2/134234573/zinokod.pdfIn PDF document text
    • https://kelukija.weebly.com/uploads/1/3/4/3/134337818/soritiwolew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498971/normal_5fe6b88771e48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372371/normal_606e8763dd830.pdfIn PDF document text
    • https://guxilidokuwog.weebly.com/uploads/1/3/0/7/130738661/3136979.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380545/normal_5fc688792a2b8.pdfIn PDF document text
    • https://penabapemuzoji.weebly.com/uploads/1/3/1/4/131453208/a264bb8f77ac48.pdfIn PDF document text
    • https://sasinulipig.weebly.com/uploads/1/3/7/5/137512958/8957815.pdfIn PDF document text
    • https://zufulakoloti.weebly.com/uploads/1/3/5/3/135301661/puniduzozad_rodadugeruxezal_midekuzesi_jivalopowid.pdfIn PDF document text
    • https://serabonileraso.weebly.com/uploads/1/3/4/4/134444783/welimebosoxabufukaz.pdfIn PDF document text
    • https://vatuwogumim.weebly.com/uploads/1/3/4/6/134605764/sewisudolek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/304e5222-b316-4dee-ba22-ea72af732fa5/how_do_you_do_interval_training_on_a_stationary_bike.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b99d74c3-c608-4c1c-a3e8-892eab1a1770/m_audio_keystation_88_price_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec3765f9-1b9e-4560-9d71-639746ace571/37025086470.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd478ab4-7bd5-4c56-87d9-f7c2590243d9/59465804769.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/581ce730-435d-4190-8a45-507e5ec62bf9/how_to_do_enthalpy_change_definitions.pdfIn PDF document text
    • http://natofuke.pbworks.com/f/lurusatufamided.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/839c4ce6-5250-4cd3-bd30-9c0f40ae9ce0/72874488710.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0981328d-8751-4352-92d4-c1bc079b92c0/jejebalexubefeli.pdfIn PDF document text
    • http://najajadux.pbworks.com/w/file/fetch/144586254/33621232664.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_off0000e03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03B 5132 bytes
SHA-256: fe5f9c56ddaeaf71b3897d442e75743c7c2fb2e234428c3e43d04aa8fe74e3d3
font_01_sfnt_off0000f1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BA 10536 bytes
SHA-256: 4b37c92c6b79e70119372dab8c29f8b27ab4c2245336a586398fa704f9e7e34b

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