Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4bd68a24ebf98a1…

MALICIOUS

PDF

77.6 KB Created: 2021-04-28 00:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5f52cff0f8bedddefeabeb71f9e9be97 SHA-1: dc2cbcff79f27d22116c4e2b0e34b0a4f4d07368 SHA-256: f4bd68a24ebf98a108b77fe171611df7039aca96766d2dce0a26cd24283c0aa0
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed to redirect users. The primary URL, 'https://druttle.ru/strik?utm_term=how+to+see+estimated+delivery+date+usps', is presented in a way that mimics a search result, likely to trick users into clicking through to potentially malicious sites.

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://druttle.ru/strik?utm_term=how+to+see+estimated+delivery+date+usps PDF link annotation
    • https://tudevapibor.weebly.com/uploads/1/3/4/8/134884273/lomutiweji-detozufuvus.pdfIn PDF document text
    • https://sorurilinoko.weebly.com/uploads/1/3/5/3/135397097/femawudokute.pdfIn PDF document text
    • https://jojusilinu.weebly.com/uploads/1/3/4/3/134343509/labawogitikodeka.pdfIn PDF document text
    • https://bamukafigozoxin.weebly.com/uploads/1/3/4/8/134861202/2ad84c8be155b7.pdfIn PDF document text
    • https://tagesokute.weebly.com/uploads/1/3/5/3/135315496/figidix.pdfIn PDF document text
    • https://lidafeli.weebly.com/uploads/1/3/4/6/134683499/nokazed-wanigakarumoj.pdfIn PDF document text
    • https://bimekofag.weebly.com/uploads/1/3/4/5/134596958/tivuxebigikemes.pdfIn PDF document text
    • https://melazikadoxu.weebly.com/uploads/1/3/4/5/134594637/bizuku_jigixux.pdfIn PDF document text
    • https://ladetizor.weebly.com/uploads/1/3/4/7/134731735/donewom-xifuzitobe-rosem-jabumiwike.pdfIn PDF document text
    • https://vafuxukosa.weebly.com/uploads/1/3/4/4/134440110/rulegozitonojej.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/924bf5a9-16aa-4131-b76d-17ecff3b85fa/international_marketing_plan_of_nestle.pdfIn PDF document text
    • https://13dbc848-c95e-4197-a439-3ae2050b6ee2.filesusr.com/ugd/46bbe5_ec9ebfe8b8184672ad47ee9190c5f4bb.pdf?index=trueIn PDF document text
    • https://1a9cd40a-f0d6-44d4-a143-19288280ca2b.filesusr.com/ugd/7a13df_cd0a53ef071143609304f89726717d7e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/04ce0be3-a67c-4a9e-8810-043029886afb/32153946347.pdfIn PDF document text
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_8ca36b743d1a4755928e13056e3f4fb4.pdf?index=trueIn PDF document text
    • https://247e77cc-5367-4382-8586-7c5891409f42.filesusr.com/ugd/2dbf5a_e0f102d5d173413f8246e4e342105e5a.pdf?index=trueIn PDF document text
    • https://33fe1336-4051-433c-b691-b763732126dd.filesusr.com/ugd/6c8f37_419b50c42bfd45a6a6d96883654ab657.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6875e664-75d1-43b3-82e1-463b1caa7a0e/hate_being_the_center_of_attention.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d894bdd3-698d-4ce8-8c57-b7ed89de3358/gimukuroruburixajixuke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1113eb02-d8ad-45fa-bd90-0a94f6ecb5c5/samsung_galaxy_s5_for_sale_cheap.pdfIn PDF document text
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_4e28a2f7aae84841a0aef7221732f917.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_off0000efb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB2 5320 bytes
SHA-256: d34add4777ec89b805dbadc66c4869c90d7744a20f38db809c2e16e16d6d6668
font_01_sfnt_off000101c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C5 11556 bytes
SHA-256: 63c6ee065e0c09afaa6f58414e672071de8b4d3fd1a1de1e6cf8b06d4550868e

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