Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ba905056fa2cf2…

MALICIOUS

PDF

83.0 KB Created: 2021-03-12 21:48:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0b21d31415f872f6c95815a2f4ba61ab SHA-1: cd42de11815bf4cacf585a14f7fe30b51a362008 SHA-256: a8ba905056fa2cf2170ab369c8916ac1052267955b89168041e4214f1a113423
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a prominent one leading to 'kuzutuzo.ru'. Heuristics indicate this PDF is a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing by masquerading as a search result.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • 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/strik?utm_term=why+is+my+nespresso+leaking+coffee PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4502833/normal_604672452fb59.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454435/normal_5fe50bcb37ae5.pdfIn PDF document text
    • http://nigavereke.mygamesonline.org/71866428558.pdfIn PDF document text
    • http://veviwumifuvemuz.mypressonline.com/all_my_sons_play_synopsis.pdfIn PDF document text
    • https://kesazawen.weebly.com/uploads/1/3/4/4/134401730/a27c88d.pdfIn PDF document text
    • https://cdn.sqhk.co/sabumijobude/abhhjre/kolivaligipomo.pdfIn PDF document text
    • https://cdn.sqhk.co/dikapagoloza/dhjfOif/kedoxikenebotatemuvi.pdfIn PDF document text
    • http://zosakapututejo.iblogger.org/nulemasigadebujupubataxo.pdfIn PDF document text
    • http://pidawudimo.scienceontheweb.net/75447155923.pdfIn PDF document text
    • https://menanotiji.weebly.com/uploads/1/3/4/3/134322389/vodutof.pdfIn PDF document text
    • https://cdn.sqhk.co/somujatiza/lJxtieS/vonufofesobubeduraxoveto.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388037/normal_5fdd3e933f8c1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sojeveme.epizy.com/what_is_the_best_pole_hedge_trimmer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/205c911f-bf80-4142-b9b4-d43dfa2a5371/firijabanemujajubofibog.pdfIn PDF document text
    • http://vilumepidiwego.myartsonline.com/lerikugawuka.pdfIn PDF document text
    • http://suvofaga.rf.gd/6575969368.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac1d674b-5606-4f2c-9c59-e69a1ce7fe48/fobotonavotuwareba.pdfIn PDF document text
    • http://roxojibato.rf.gd/71450740211.pdfIn PDF document text
    • http://gurabagoderes.atwebpages.com/fidaxupamikosokesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cee467e-ca4d-4e17-821e-9f0288e692b9/73299272366.pdfIn PDF document text
    • http://sawuliwinupunud.epizy.com/40615435982.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b5b0855-8e93-427c-94ef-f724a9be26f3/5489999225.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000feea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEA 5608 bytes
SHA-256: 208425942030b0c7b66435babc9ffd1040742aba469cf135db40510d52b6ee08
font_01_sfnt_off000111e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E4 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off00011a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A72 10436 bytes
SHA-256: 08829b48fbc2cb9609ab9822f16c8bc87545d3ba3ee174a1233d00aadb1d51ff

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