Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf9dbc4ac03b2d9…

MALICIOUS

PDF

97.8 KB Created: 2021-03-25 04:13:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 034e423f7db7d7596eee6691087ea1d1 SHA-1: 9cc0d22fafa7e2a277083c59f86a204bc3763a17 SHA-256: 5bf9dbc4ac03b2d99598587688e173d7db3acf6b3c7b760d7daa59424e184a36
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm. The primary purpose appears to be SEO manipulation or distributing malicious content via these links. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/award?keyword=anomalias+gastrointestinales+congenitas+pdf PDF link annotation
    • https://malabukepi.weebly.com/uploads/1/3/0/9/130969546/0a0bf5.pdfIn PDF document text
    • https://ribigitapupag.weebly.com/uploads/1/3/4/8/134887221/panutuzig_lopepo_zodemubugalifib_vefefazadeset.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375342/normal_603c847a4d22d.pdfIn PDF document text
    • http://idealslimitalia-oficial.site/gelivakimitalopozi3rl6n.pdfIn PDF document text
    • http://cparta.moscow/roxibifodimubuzuguxm5762.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457011/normal_6040227950c73.pdfIn PDF document text
    • http://vitavolu.22web.org/dakigitabibixa.pdfIn PDF document text
    • https://xadajosawot.weebly.com/uploads/1/3/1/6/131636584/tiraf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501045/normal_604823865fc66.pdfIn PDF document text
    • http://lienforkid.com/call_me_by_your_name_movie_quotes_fatherbi6mh.pdfIn PDF document text
    • http://pogadai.xyz/tupperware_rice_cooker_microwave_instructionsyvwep.pdfIn PDF document text
    • http://easy-money-cash.space/used_to_play_pretend_money_lyrics0hbds.pdfIn PDF document text
    • https://ketafimevudo.weebly.com/uploads/1/3/1/6/131637081/5008906.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pegalisijeg.epizy.com/kizubadigimujabexu.pdfIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_e33ee0294aa946fbb5b883b08effb208.pdf?index=trueIn PDF document text
    • http://kofujuluzode.epizy.com/fractions_halves_and_fourths_worksheets.pdfIn PDF document text
    • https://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_8c8b8a6f264940aebcee03c0a1fa5824.pdf?index=trueIn PDF document text
    • https://d75bbb92-b0e4-4b50-83e6-2443e695523b.filesusr.com/ugd/bc73b9_92dd86e18afd427089ea22dae81884a0.pdf?index=trueIn PDF document text
    • http://xadujagi.epizy.com/brown_eyed_girl_chords_and_lyrics.pdfIn PDF document text
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_7d95d2188cb948ff885f3a8f4e73579a.pdf?index=trueIn PDF document text
    • https://7ec9ed57-df89-401a-953b-45744c150cee.filesusr.com/ugd/6e3131_4f32c592ef1c4b2eb3ea650506a5171b.pdf?index=trueIn PDF document text
    • https://ffb80149-315c-4936-8637-e87477b606fc.filesusr.com/ugd/e7410d_13dcc43bad9c47238659d815e8d53ece.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_off00013db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB4 5464 bytes
SHA-256: 74b1e3785c6c4ad4cd4d0a723d826ba11339af47fc47452ca017e21538f13e6d
font_01_sfnt_off0001502c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1502C 12232 bytes
SHA-256: 3b670767daf9e9daa252c489f0500113295c4e7ad8ce2475603d3dd0c687666e