Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f5cd64edf21a9d…

MALICIOUS

PDF

75.3 KB Created: 2021-06-12 07:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3ec530103a92f045c87822f3bdcb0b43 SHA-1: 1521aae60aa281861531dcc5160b6a5ec8d85c51 SHA-256: b4f5cd64edf21a9d0d12cfb09aa981235c0f8afa579ce5baab0319828cebc297
146 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs, with one notable URL pointing to a potential phishing or malware distribution site. The document's structure and content suggest it acts as a lure, potentially a link farm or a deceptive download, to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://pixomot.ru/pbw?utm_term=unlock+bootloader+redmi+note+4x PDF link annotation
    • https://nogomikosisodop.weebly.com/uploads/1/3/2/6/132681488/2039055.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424647/normal_600b71bb81dfc.pdfIn PDF document text
    • https://jemikarabon.weebly.com/uploads/1/3/0/8/130815017/1906455.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393925/normal_606a221b7d1de.pdfIn PDF document text
    • https://gidedumewulo.weebly.com/uploads/1/3/5/9/135961218/9789082.pdfIn PDF document text
    • https://razixolinatu.weebly.com/uploads/1/3/4/3/134384461/fakunagofegelakume.pdfIn PDF document text
    • https://tedovuja.weebly.com/uploads/1/3/4/4/134465286/pifovig.pdfIn PDF document text
    • https://dalideno.weebly.com/uploads/1/3/5/3/135384103/6284704.pdfIn PDF document text
    • https://libakitaxejadeg.weebly.com/uploads/1/3/4/0/134096258/5732357.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462993/normal_5ff0f6bd3d678.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409405/normal_5fe7fbca03667.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/39a34309-1452-49f8-9d9b-bae36faf0d9e/veronika_decide_morir_libro_descargar.pdfIn PDF document text
    • http://fozujedax.pbworks.com/f/8277792187.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77cd3c90-a1d0-410b-b9d9-4336c22d885c/how_to_change_the_day_of_the_week_on_a_timex_marathon_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12c99033-a080-4667-bf6f-0f4d9c34c06d/what_is_the_most_common_objection_to_social_contract_theory_quizlet.pdfIn PDF document text
    • http://fawugomem.pbworks.com/w/file/fetch/145174548/wepali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3143fe7-96bf-47dd-883e-d0b8cc229008/94367064914.pdfIn PDF document text
    • http://fudotedafeji.pbworks.com/f/vexopugodukibor.pdfIn PDF document text
    • http://rawumadakora.pbworks.com/w/file/fetch/144752016/minecraft_pe_xray_hack_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dc6239b-04d8-4ac8-87dc-5cd1180011c3/presto_11_inch_electric_skillet_reviews.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_off0000e926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE926 5260 bytes
SHA-256: 12ccc2806375477e58611f2b78eafd2b44e1a3c2543da5a4d4c9332aabb40e7d
font_01_sfnt_off0000fb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB00 10876 bytes
SHA-256: fffc46b7083d7aa0499912d1c9bf488bc364ca6dd176f3c84df76f540530214c