Malicious PDF — malware analysis report

Static analysis result for SHA-256 845f93a0871610d2…

MALICIOUS

PDF

76.4 KB Created: 2021-03-27 17:30:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 9c93f3898da08639e3b0152c1bfb3691 SHA-1: feed576795780c1ff5b580330fa2008db6be6564 SHA-256: 845f93a0871610d2ef21b725206c16ff4ac0dbd8058746a4b9bfde8eed639f0f
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. One of the primary external links points to a URL that appears to be part of a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • 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://botokaw.ru/strik?utm_term=how+to+pair+vizio+sound+bar+with+subwoofer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376850/normal_60255677281ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414867/normal_5fe751e7298bf.pdfIn PDF document text
    • http://ozalupa.space/tamilrockers_tamil_movies_2017_hdqea0e.pdfIn PDF document text
    • http://opencabinets.xyz/why_wont_my_troy_bilt_lawn_mower_startm9uds.pdfIn PDF document text
    • http://obmenkalnr.online/ridiwumibiti69mdy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468572/normal_5feb86dbabf1a.pdfIn PDF document text
    • https://rexawalifutox.weebly.com/uploads/1/3/4/4/134458468/zoxofixikilag.pdfIn PDF document text
    • http://hermidkovo.info/how_do_i_renew_my_ma_drivers_license_online_in_floridavop2v.pdfIn PDF document text
    • https://wavuzujez.weebly.com/uploads/1/3/1/4/131406867/748110.pdfIn PDF document text
    • http://vorgazme.com/redi_check_thermometer_probewmroh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504870/normal_60177d7d2ed74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478125/normal_60358431cd413.pdfIn PDF document text
    • https://toruganaduloxo.weebly.com/uploads/1/3/5/3/135347606/eeb9b46c69126b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500679/normal_5fe7a2d572226.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/rawesaragegugar/angela_carter_tiger_s_bride.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/when_does_income_have_to_be_reported.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/bosuxet.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/viposuvoja.pdfIn PDF document text
    • http://xevorerokune.epizy.com/tesco_corporate_social_responsibility_report_2018.pdfIn PDF document text
    • http://nogamijabuwemi.rf.gd/notorious_big_movie.pdfIn PDF document text
    • http://japivolenalu.epizy.com/calendario_laboral_colombia_2020.pdfIn PDF document text
    • http://zuxorijafofonal.rf.gd/what_is_the_definition_for_time_capsule.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/98880254767.pdfIn PDF document text
    • http://bigisewolax.epizy.com/punuxewuzuxixezup.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_off0000ee5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5A 5400 bytes
SHA-256: 1a02a5dcb12caa7a006d15842c9ef642ab588d6bf9d53e5440ea2bc979e8ccce
font_01_sfnt_off000100ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CA 10140 bytes
SHA-256: cb431b1eee374517ac509da3290f589c956bfd1034d79175bd530c041ffc4f9e

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