Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c8832ddcc534ca…

MALICIOUS

PDF

75.6 KB Created: 2021-03-29 19:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 22edd055910e1a51da4b9a25715a5bc9 SHA-1: 53e0cbfaa9290da361a44266d76d19c23e86e4b0 SHA-256: 38c8832ddcc534ca771eedcd981c199f5a96fba3d88629115dca62436a91d786
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 0.9997

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://seumenha.ru/award?keyword=concrete+admixture+pdf+seminar PDF link annotation
    • http://faceskinagainbeauty.xyz/fepanabazudidimkv9k7.pdfIn PDF document text
    • http://helplnstagramcontact6088758.com/98160912427l2v52.pdfIn PDF document text
    • http://yeswins.space/skyrim_creature_animations400mh.pdfIn PDF document text
    • http://limevekobo.iblogger.org/hd_film_site_name.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://zumedemuruva.22web.org/sukitilopejawoma.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/konikekirosexet.pdfIn PDF document text
    • http://poferivinogaram.epizy.com/91574757913.pdfIn PDF document text
    • http://watuvul.epizy.com/8191622072.pdfIn PDF document text
    • http://pimibini.epizy.com/ccavenue_android_sdk.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/ditabawodukutevumevan.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/mesa_behringer_x2442usb_xenyx_mixer.pdfIn PDF document text
    • http://jemibare.epizy.com/76841330813.pdfIn PDF document text
    • http://wufofot.rf.gd/18172712436.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/816e79e5-dc52-4840-8204-965f940688c8/70900470884.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/aptiom_drug_information.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a21ba9b5-357c-4198-a62e-2a7092a980e8/employee_performance_appraisal_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/white_screen_on_acer_monitor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20f3c421-e0a5-48d6-9720-62c927db35e3/66508176690.pdfIn PDF document text
    • http://mefomoximene.rf.gd/dogowijosilovufe.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_off0000e912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE912 5244 bytes
SHA-256: 070bd13494eade2b532ce4c71017077ac504763659e282bb0857822ea05cce54
font_01_sfnt_off0000fad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD2 10772 bytes
SHA-256: 70ec3e97a03fe2ef1bde43eb8fbc635dddee2cca4352c48696ab9236ca1f67d8

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