Malicious PDF — malware analysis report

Static analysis result for SHA-256 889828f7eeb40a5a…

MALICIOUS

PDF

92.6 KB Created: 2021-06-11 19:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b6f850c67bd96cb805021ed42b110266 SHA-1: 3dfb378e6909334e53c88def78cfef9547cf6720 SHA-256: 889828f7eeb40a5a55459e99125775ba3659d5de899b2792640aa2547c9dcd2f
186 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to potentially malicious websites, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The primary lure appears to be a fake download for 'contract killer mod apk unlimited money and gold'. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to exploit users through deceptive links, aligning with phishing and potentially malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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 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://medvor.ru/pbw?utm_term=contract+killer+mod+apk+unlimited+money+and+gold PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454559/normal_60be77e01a6d4.pdfIn PDF document text
    • https://larebefol.weebly.com/uploads/1/3/4/6/134691273/19cfe0e0a5c31d.pdfIn PDF document text
    • https://darimigavibibej.weebly.com/uploads/1/3/3/9/133997658/refagoxisolimujodu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387240/normal_5fed0094a0d37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425738/normal_60372b1fe6cf6.pdfIn PDF document text
    • https://valezuxaj.weebly.com/uploads/1/3/4/6/134650604/e7e76cf3fce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463266/normal_5fe433796a1b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446931/normal_606c04658a65d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486051/normal_60625a9720f72.pdfIn PDF document text
    • https://womonejod.weebly.com/uploads/1/3/2/6/132681039/molezef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458404/normal_60bd3a4b31a66.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b85b6065-2c82-44e3-9204-e0343951098a/mac_audio_drivers_update.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd1aac6c-d84e-4887-8031-c5d7856a4b09/2nd_grade_math_3_digit_addition_and_subtraction_worksheets.pdfIn PDF document text
    • http://tabujaz.pbworks.com/f/4523186119.pdfIn PDF document text
    • http://wabajafadi.pbworks.com/w/file/fetch/145007430/dark_knight_bdo_skill_build_2020.pdfIn PDF document text
    • http://mudowomuxexo.pbworks.com/f/gcam_mi_note_8_pro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1b2cc94-a836-4501-a983-a2302787af20/44429749148.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d701ae24-70da-411f-a88e-f1fdac11a26e/apa_itu_frappuccino_starbucks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4a92fbd-5b91-42bb-a9c1-5e13f30a6f22/sifad.pdfIn PDF document text
    • http://pukiniwu.pbworks.com/w/file/fetch/145040835/47460700224.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26855afd-2948-42ca-9961-34202343b54e/fisher_and_paykel_washing_machine_parts_ebay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81eb97ab-7d1b-4709-b112-e430b06a8781/lenovo_ideapad_110s-11ibr_charging_port.pdfIn PDF document text
    • http://sutodoromar.pbworks.com/w/file/fetch/144715800/nekudebipag.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_off0000f448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF448 5360 bytes
SHA-256: f1749a6dd59115f4d255ea21b730acac3f3dadcefec3e5dc3cab1d74c8642aef
font_01_sfnt_off00010702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10702 5284 bytes
SHA-256: 454dbcbea7377518f34ee2db3a17db72b2ad2d0c81b52bcd9c0989a87decdc6e
font_02_sfnt_off000118f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F1 21324 bytes
SHA-256: 2976b6af46590f0178c04d3da9086d88e88477678bf2673957e17ebb8b183fcf
font_03_sfnt_off00014cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CF7 16620 bytes
SHA-256: 321840b707e62f3bd1656f1d40f95ed8bb348a2b5a8038cdfd06971b4a6f9fa9

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