Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e6425b7cd8219d1…

MALICIOUS

PDF

93.4 KB Created: 2021-03-07 20:40:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 08b83153f048b8a695d9e3e11b410919 SHA-1: 76f78cecb3d64d7c6e00b1665151efce979b16f8 SHA-256: 9e6425b7cd8219d15c322642042bc5ced9c70d87d66ea22f1ad6d5f54364da34
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a significant number of external links, identified as a link farm, with a primary URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://pelibifir.ru/strik?utm_term=the+man+in+the+high+castle+wiki+frank PDF link annotation
    • https://cdn.sqhk.co/gufemazibafi/shbifX2/11219039722.pdfIn PDF document text
    • https://cdn.sqhk.co/zalenelavup/hghC3hb/wajibusijuv.pdfIn PDF document text
    • http://help-nanny.site/national_geographic_magazine_contributor_guidelinesnafpk.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/hagjjcG/animals_ringtone_app_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zuronenom/uhdShbF/ping_pong_rules_netball.pdfIn PDF document text
    • http://topmassage.net/zudapulqzsy.pdfIn PDF document text
    • https://cdn.sqhk.co/fesakesovoka/htDha7v/white_gallery_wall_frames_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/kixobaza/hLjagfJ/cross_stitch_games_free_online.pdfIn PDF document text
    • https://cdn.sqhk.co/dabebasavus/cKidPjh/77193542025.pdfIn PDF document text
    • https://cdn.sqhk.co/fojilude/3Rgjhbh/galaxy_watch_2_bands.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://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_701f8723f781466292eb2a652f6b3931.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d01d040c-1db4-484b-8f66-0050a1b20dc5/77133707401.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9a5d316-667f-4d8b-8a3b-be76f28fee65/18382085906.pdfIn PDF document text
    • https://d992f69e-bc5b-430a-92d7-abfd66d0380b.filesusr.com/ugd/6f7357_902ab863a8df41508e00eb357ad53768.pdf?index=trueIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_bb60e66234d24d30a81a528cef93ef98.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f6fd2dd-f5e0-4ef8-874f-0673b409c4cc/21661664457.pdfIn PDF document text
    • https://9df6e0af-a028-4e88-91ba-61a1b37318d5.filesusr.com/ugd/7c1f05_f43b318d29cd499eb95daedbe2b0429e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8a6f92a-3724-4d37-8811-1538f37eaaff/cido_sulfrico_peso_molecular.pdfIn PDF document text
    • https://d0275d90-c5b4-4c72-b581-d0e2b62fc6dd.filesusr.com/ugd/ee54da_5859e009f61847fea310fc27ceaa3916.pdf?index=trueIn PDF document text
    • https://f62823ea-e863-4eb7-bd7c-e3bac0139ff1.filesusr.com/ugd/8c639a_4270119c7a6f418c9473d005f128e0d7.pdf?index=trueIn PDF document text
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_f004518ace514749905c4e277556ec93.pdf?index=trueIn 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_off00012016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12016 5080 bytes
SHA-256: 1f9ae6b40d5b3c74e7cb620c958361d1e2226a715f77bb59532012236f2f9d06
font_01_sfnt_off0001313c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1313C 12692 bytes
SHA-256: dfc581791417006543dedc08881228bde9f2addf8f2ec48fc525077163f71a64
font_02_sfnt_off00015965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15965 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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