Malicious PDF — malware analysis report

Static analysis result for SHA-256 91de7486193df61c…

MALICIOUS

PDF

79.4 KB Created: 2021-05-01 21:34:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 65e27897c9f8154877e698a9b4d3cdb4 SHA-1: 852527c97536c539c9a53a60ba8fc52fce0c3aa4 SHA-256: 91de7486193df61cc266ed9d0110219b2a4e2800163eb9e3f456082a1ed05f86
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 0.9998

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://golowaki.ru/strik?utm_term=usmle+step+1+question+bank+free+download+pdf PDF link annotation
    • http://regsenatvumen.website/4707264539de6j1.pdfIn PDF document text
    • http://jigitozunawada.66ghz.com/bosch_obd_1000_pocketscan_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/kinuneba/hbMsRgd/australian_survivor_island_location.pdfIn PDF document text
    • http://bonboxstudio.com/1n4007_datasheet_fairchilduecuf.pdfIn PDF document text
    • https://seruborakumew.weebly.com/uploads/1/3/4/8/134849990/wepamepe_nejatibal_kixipom.pdfIn PDF document text
    • https://binamakizixevuj.weebly.com/uploads/1/3/2/8/132814618/jimebakub.pdfIn PDF document text
    • http://starconflict-game.ru/informal_email_writing_exercisesz2ybz.pdfIn PDF document text
    • https://cdn.sqhk.co/feduvefas/dmb2gcv/fox_world_travel_brookfield.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
    • http://purevaxa.epizy.com/loophole_in_lsat_logical_reasoning.pdfIn PDF document text
    • http://bewaxupu.rf.gd/informacion_sobre_aurelia_velez_sarsfield.pdfIn PDF document text
    • http://wifudozakiteg.epizy.com/25796664051.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/balanced_and_unbalanced_forces_worksheet_year_3.pdfIn PDF document text
    • https://s3.amazonaws.com/latufenaw/muwefuleguga.pdfIn PDF document text
    • http://munuvuzuwewojef.epizy.com/26534964919.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cd22eee-667e-4535-b571-d1c5e9c815c1/skilsaw_12_amp_7_1_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51e53f38-8501-4645-85d9-07b3da545621/17605153257.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b43f7145-fbba-488c-8b36-3b84f9021f06/1659350815.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE672 5536 bytes
SHA-256: f781302e12d8433a06a5470d35fa3964296c836fc620763f38fbdf80110ba2e5
font_01_sfnt_off0000f93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93C 12068 bytes
SHA-256: 91252a51440a065850628ac1f83a1ec736484084990c7f6fabb48d58cff927d8
font_02_sfnt_off0001222f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222F 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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