Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f25e6fccc44b41b…

MALICIOUS

PDF

81.6 KB Created: 2021-05-01 01:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6e9e7c02846bab47b7b1385835bcf573 SHA-1: 53b7d2e46008cc9a5aacc785a5f4303f00d3fca5 SHA-256: 4f25e6fccc44b41b77d55ecb744ac875001985e9c2d8ae32b222edc753d71e38
166 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 0.9990

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://gimoguvi.ru/strik?utm_term=who+is+the+best+clay+court+tennis+player PDF link annotation
    • http://loginwithfb.site/95047224638658lk.pdfIn PDF document text
    • http://jesuter.22web.org/78360983501.pdfIn PDF document text
    • http://puralivivupose.iblogger.org/1998_kawasaki_prairie_400_carburetor_rebuild_kit.pdfIn PDF document text
    • http://duplicwcnj.space/dafafowevabalujofoxa35z8.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://uploads.strikinglycdn.com/files/963ddb69-573c-4d63-88c0-099d239ef932/which_thrawn_trilogy_is_better.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87104db9-4887-41c1-94c5-0173e95459f6/jbl_flip_3_firmware_update_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d46d2096-8f2a-4b1f-96a1-9ea7e38b3d3c/37288377411.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f52b389-d488-44ef-8d95-3479ff32310b/91164154557.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/660ebcdc-6233-4ad9-a0f5-bd232a1c34d0/13398573718.pdfIn PDF document text
    • http://mopapawav.rf.gd/can_the_body_recover_from_alcohol_abuse.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/83029759172.pdfIn PDF document text
    • http://zunebodiz.epizy.com/32376754033.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c982b45-9169-4be0-be18-34c53a990fd3/85048346888.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/herman_miller_aeron_vs_embody_gaming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50b36e26-f2d8-45c1-855a-2e3319062671/vusolixamapopipepepa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ff59f9f-15e0-44a6-9af1-7d514589f706/dotijogu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4026b8f6-9f89-47b5-93b6-824ffb65cdf4/dell_e6410_ram_1600.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/usps_priority_mail_international_tracking_countries.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/91916777808.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/best_avatar_maker_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49c4d298-8f83-4b81-a414-74b01c7ce398/to_be_a_slave_julius_lester_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63f388ad-b1d5-444e-82de-fd39b47d7b26/allpowers_20a_solar_charge_controller.pdfIn PDF document text
    • http://perevis.epizy.com/duchess_of_malfi_as_a_jacobean_revenge_tragedy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce7840a4-3a8e-4024-acac-65b4413e8a3a/ohio_university_football_parking_map.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_off0000f500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF500 5160 bytes
SHA-256: 91f3aafcc9c7bd46fe2dc25187f91502386e6da8bdcd8ea86b3a584912d67d17
font_01_sfnt_off0001068f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068F 10432 bytes
SHA-256: 4a2b9c23119529893e053ac9776de90305fa9daae4f7044f8885cbfeb6aca653
font_02_sfnt_off00012a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A59 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176