Malicious PDF — malware analysis report

Static analysis result for SHA-256 d50ed336b6f5eea3…

MALICIOUS

PDF

80.2 KB Created: 2021-03-07 14:55:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: bbf7675db866b76659ce3db9190b6eb7 SHA-1: 217b29a00a97b87be86a607288ee36a442771298 SHA-256: d50ed336b6f5eea3a5eaf126144e84c307b872c62f79efb686cf216a4b9a3e1e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm, with many pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing malware. The primary function appears to be redirecting users to potentially harmful content via these numerous URLs.

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 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://kuzutuzo.ru/123?utm_term=the+invisible+hand+of+the+marketplace+will+ensure PDF link annotation
    • https://wazexexa.weebly.com/uploads/1/3/5/3/135305699/805144.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/onkyo_tx-nr515_arc_not_working.pdfIn PDF document text
    • https://palivifu.weebly.com/uploads/1/3/3/9/133986562/kirukab-maveritit.pdfIn PDF document text
    • http://creamwalls.online/fichas_cte_septima_sesion_201953oba.pdfIn PDF document text
    • http://baranaydin.org/zifebetoxuzatubagitugarkarzg.pdfIn PDF document text
    • http://compte-cmbretagne.best/hcna_routing_and_switching_dumpsqh1gb.pdfIn PDF document text
    • http://fajujefa.getenjoyment.net/thats_the_ugliest_thing_ive_ever_seen.pdfIn PDF document text
    • https://lafuxekezijunu.weebly.com/uploads/1/3/1/4/131406487/95bfbbf2cc8.pdfIn PDF document text
    • https://zomoxiwoginu.weebly.com/uploads/1/3/1/6/131637743/xezilawofofub-dewur-dunafen.pdfIn PDF document text
    • https://jatevabuxises.weebly.com/uploads/1/3/5/3/135382810/0389a1a70a.pdfIn PDF document text
    • http://zagejudivavi.sportsontheweb.net/gigadaganem.pdfIn PDF document text
    • https://jutemutugitut.weebly.com/uploads/1/3/4/6/134617260/lutekojiluf_xefemoviwiwume.pdfIn PDF document text
    • http://jijuduli.mywebcommunity.org/waruvepebir.pdfIn PDF document text
    • https://voduzivet.weebly.com/uploads/1/3/1/6/131607522/repimifemuxi_nanoke_bofapujapumi_tuzepepuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_b74dbe546fbb4701947033a77ef9f9c3.pdf?index=trueIn PDF document text
    • https://50aad03f-9d2a-47e6-be13-abd12f321b17.filesusr.com/ugd/3fd638_0e586e4bc576415a89417db3b77d27d3.pdf?index=trueIn PDF document text
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_34ed340dc21e4d15bb5627011cbbf078.pdf?index=trueIn PDF document text
    • https://a49aa754-465e-4bbd-924e-b3d0e7b66bd4.filesusr.com/ugd/81d6a4_c458611f44a14b0eb298cf6eafdb8648.pdf?index=trueIn PDF document text
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_b7c83cdd9eac408fa2fdb5c383a4e872.pdf?index=trueIn PDF document text
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_ed60fd616db74dc3b6ba508cfa6e5203.pdf?index=trueIn PDF document text
    • https://1864c106-1a4f-4194-99fb-dabd5a0af450.filesusr.com/ugd/17b194_4c18c85f01a54f6cb2b9bf7cf06b37b4.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF903 5700 bytes
SHA-256: 46061918d9ed50aa2292a68bc4160d0811bacdfbc65840b6e76159ec1f654a12
font_01_sfnt_off00010c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4A 12080 bytes
SHA-256: ed84882ed2c7bd9250fd1f20f8aac0ffd2aa0f2fe5ea8175924761c519947309