Malicious PDF — malware analysis report

Static analysis result for SHA-256 84eea775e889233a…

MALICIOUS

PDF

69.3 KB Created: 2021-02-19 13:53:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: cd484ae662543eb8283bbe139cdc409b SHA-1: 41491cc6a9b65a5ef7e89fedd1ec2e2459183898 SHA-256: 84eea775e889233a91368c720d431ae2799c2e200be00b222169beefdd191905
186 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. It contains a large number of external links, many pointing to disposable domains, consistent with a link farm or SEO manipulation tactic. The presence of a 'utm_term' parameter in one of the URLs suggests a phishing or tracking attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/strik?utm_term=is+roku+box+better+than+stick PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456128/normal_602d0ef34aa14.pdfIn PDF document text
    • https://bitoranajezope.weebly.com/uploads/1/3/1/4/131453137/9899094.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460706/normal_601e21906883e.pdfIn PDF document text
    • https://duzejuwilana.weebly.com/uploads/1/3/4/8/134879611/muxitirenuliri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451940/normal_5fd7fa6d6e6dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475727/normal_5fefc19de62c2.pdfIn PDF document text
    • https://xonokuraku.weebly.com/uploads/1/3/3/9/133988937/tideboko_suremopor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459035/normal_6017b1af0c3e3.pdfIn PDF document text
    • https://jugivukovetid.weebly.com/uploads/1/3/0/7/130739525/mevemotowefax.pdfIn PDF document text
    • https://lijipipixeralof.weebly.com/uploads/1/3/3/9/133999964/midijurir.pdfIn PDF document text
    • https://jogojirodatu.weebly.com/uploads/1/3/4/3/134321770/panazupufipowu-xalimagawosunew-ramurefonow.pdfIn PDF document text
    • https://favaruzikab.weebly.com/uploads/1/3/4/8/134871436/893570.pdfIn PDF document text
    • https://bubigijezifaju.weebly.com/uploads/1/3/1/3/131380429/bajirugibew-waruvufu.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/xukirizugukugi/1-_60_leveling_guide_alliance_classic.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/abu_maternity_uniform_size_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/scert_odisha_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/vavolowufusotifovim.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/brightness_driver_for_windows_8._1.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34E 5064 bytes
SHA-256: 7ba3b9d1946f529df2f35b46ee1c6aba7b8b968eb6810ce5d52b19db35bda9d6
font_01_sfnt_off0000e484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE484 10472 bytes
SHA-256: 941a0adf24ddef352f0124fa248feb98d39428d75da5ff415485027563fda070

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