Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb7b829f47e4a2ab…

MALICIOUS

PDF

82.1 KB Created: 2021-03-12 21:20:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 38449aed1aaba6656a633d32bfe6cc54 SHA-1: b3a52ec51d5452d05e1dd47ac352c1cde031205f SHA-256: cb7b829f47e4a2abf2ba2159546e8506a943182dd995fffae27d78f8e8cdb5f9
126 Risk Score

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 0.9983

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://dafemum.ru/award?keyword=bhagavad+gita+in+oriya+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452837/normal_6034900a524f7.pdfIn PDF document text
    • http://busumewum.22web.org/fosojapam.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/MfWjeic/puzzle_bubble_games_online.pdfIn PDF document text
    • http://goshop32.site/71089077684otwgj.pdfIn PDF document text
    • https://gadofipod.weebly.com/uploads/1/3/6/0/136056298/b358b8a8.pdfIn PDF document text
    • http://srakan.space/wefanabonb0292.pdfIn PDF document text
    • http://tehnopolis.org/the_summer_i_turned_pretty_summaryyocus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387814/normal_6023365d7bd78.pdfIn PDF document text
    • https://cdn.sqhk.co/ziveluki/QihmHrE/silewinaletawuvudim.pdfIn PDF document text
    • https://jokinurelebuvet.weebly.com/uploads/1/3/1/8/131856462/vakobojufuzogi.pdfIn PDF document text
    • https://wetuwisiw.weebly.com/uploads/1/3/4/4/134495793/rogazokove.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415950/normal_60316b4617c5a.pdfIn PDF document text
    • http://armada.technology/729778662598e6of.pdfIn PDF document text
    • https://rurefisofe.weebly.com/uploads/1/3/5/3/135325463/gokokejuje.pdfIn PDF document text
    • https://puwibovur.weebly.com/uploads/1/3/4/6/134639487/dewanepanafuwu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388157/normal_5fcc44f4e3dda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387701/normal_602f9d78a1b11.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://tumofif.rf.gd/java_8_new_features_durgasoft.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd13b243-c047-4c2e-8743-b041ec8014cf/kenwood_tm-d700e_transceiver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dbb0a5b-5d4c-4c31-b289-625d42046af1/basketball_inbound_plays_for_youth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6523a4d9-07b7-4c2e-8c32-4fdd188b9972/45767446616.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf1dc04f-cd17-44c6-b2f3-8e377d4c32c9/15942325098.pdfIn PDF document text
    • http://baledur.epizy.com/530391037.pdfIn PDF document text
    • http://gizimup.epizy.com/vixogezidepuvose.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE179 5428 bytes
SHA-256: ddc18f6c3f6221c74db8de636db116fc107a943d0f00331485b837e261ccd434
font_01_sfnt_off0000f410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF410 10136 bytes
SHA-256: c1c318ad662280dcf004f251e60dce3a5fc42b9f7e1df77bbb67fe77f1018c75
font_02_sfnt_off0001170b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170B 16172 bytes
SHA-256: 6e699eab9a6fef16b3ea923df7b93ce1c5cbd97c7a594d359cd98c90be4a35f1
font_03_sfnt_off00012c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5D 3284 bytes
SHA-256: 4ec0c997d0866026176d2ac9b7acb0a981f0d0a233a02b6ccf252c62abe57b01