Malicious PDF — malware analysis report

Static analysis result for SHA-256 6725bf3ca9cb06c3…

MALICIOUS

PDF

106.8 KB Created: 2021-03-24 20:01:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 35da77420318a47cec177c2400c35f93 SHA-1: d9957b1993d956d0dcfe25195c3be384ab63a80a SHA-256: 6725bf3ca9cb06c3c6161899e567d0c190c07f905486ebd114f62ff49325dc6a
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing campaign. The embedded URL 'https://baarspo.ru/strik?utm_term=what+year+was+elton+john%2527s+first+hit+song' is likely part of a lure to direct users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=what+year+was+elton+john%2527s+first+hit+song PDF link annotation
    • https://monezoxikaxusoj.weebly.com/uploads/1/3/1/4/131453753/61090.pdfIn PDF document text
    • http://pro-komp-master.website/jenovolelerohudhc.pdfIn PDF document text
    • https://sufudoni.weebly.com/uploads/1/3/4/8/134853368/buzidoxelonov-nenufejigaxopog-zifumi-vefuberozez.pdfIn PDF document text
    • http://usacreditreport.info/17764882819jkbou.pdfIn PDF document text
    • https://jesipawuba.weebly.com/uploads/1/3/0/8/130874316/tedudixesogoxinelubi.pdfIn PDF document text
    • http://afracheat1.xyz/49013484470gvfle.pdfIn PDF document text
    • https://fatilisuwojumo.weebly.com/uploads/1/3/4/6/134652656/35d188716.pdfIn PDF document text
    • http://powerpoint4you.ru/4129849818r8p3n.pdfIn PDF document text
    • https://wigufigavotafo.weebly.com/uploads/1/3/1/4/131452860/pewasivuvovemolef.pdfIn PDF document text
    • https://nevidabaxava.weebly.com/uploads/1/3/0/7/130775666/f1c73117bef13e9.pdfIn PDF document text
    • https://dinuboxisoxim.weebly.com/uploads/1/3/1/8/131857966/nuwaramiz-tumepenumemepeg-tuxefox.pdfIn PDF document text
    • https://nuxirudeduw.weebly.com/uploads/1/3/4/4/134442083/5054872.pdfIn PDF document text
    • http://policyhelpcenter.com/carols_by_candlelight_2018_melbourne_tv_guidefucoq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wurivuve/43213145593.pdfIn PDF document text
    • https://5f8b0e40-2141-4341-98ab-6145db4b8156.filesusr.com/ugd/2072cd_eb49e71aa4d84884a8f8b742f91fa398.pdf?index=trueIn PDF document text
    • https://46d16763-6c5f-4e19-aa2c-3f4071fcbec2.filesusr.com/ugd/26f730_ac647ecd67ba42e89bc7eea9c5cd69c1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nojemi/fobizigimuz.pdfIn PDF document text
    • https://48e4e0df-78ce-4736-8797-27735e68dc67.filesusr.com/ugd/f3b179_d62c1510795c47a48b2a7b5059d7c266.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/remuv/37405403207.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B61 5344 bytes
SHA-256: 222248d65bee64469506293e8dc872d40135f048a981b4d07211b27a9efd3463
font_01_sfnt_off00015db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DB7 12924 bytes
SHA-256: 41566a84b2e029c12bdd5fe6914fce57e93f3f149eb9dcc63a4c1cd415a02c71
font_02_sfnt_off0001886b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1886B 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330