Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c3ed38f967b74e…

MALICIOUS

PDF

74.8 KB Created: 2021-02-20 10:47:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 0b84aed338a0692775cde93c51a4424e SHA-1: d76705953e69abcff47dab7b3498af2192b961ce SHA-256: 82c3ed38f967b74e2d3f02014824f47e0e2c6509d3a30f12015ec91efef1bb54
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier strongly indicate this is a phishing or trojan PDF. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious workflow, likely involving the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/123?utm_term=washington+gastroenterology+arlington+va PDF link annotation
    • https://zepitobazelaki.weebly.com/uploads/1/3/4/6/134619491/0ca497.pdfIn PDF document text
    • https://kokozorakozuwel.weebly.com/uploads/1/3/0/7/130775651/tubojez.pdfIn PDF document text
    • https://lukafitujukeme.weebly.com/uploads/1/3/3/9/133997152/rebavorageloj.pdfIn PDF document text
    • https://solusolifodijal.weebly.com/uploads/1/3/4/4/134433047/gadir_tatisevabuf_buluj.pdfIn PDF document text
    • https://fogofude.weebly.com/uploads/1/3/4/3/134322730/rubaromajos.pdfIn PDF document text
    • https://cdn.sqhk.co/rapawaferew/OhcehfW/star_trek_timelines_pvp_guide.pdfIn PDF document text
    • https://xukifunizagopo.weebly.com/uploads/1/3/4/0/134013279/131358.pdfIn PDF document text
    • http://nopubejojawe.22web.org/65467878734.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobuwaxegu/jahiayw/nizirom.pdfIn PDF document text
    • https://nikakakuko.weebly.com/uploads/1/3/1/8/131871571/7147057.pdfIn PDF document text
    • https://cdn.sqhk.co/mirofifuba/81xMgh1/tales_of_crestoria_characters_tier_list.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/zabejuvijolu/tiwabijonasijofugim.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/54065213015.pdfIn PDF document text
    • http://xitiwefebulu.rf.gd/marguerite_yourcenar_alexis.pdfIn PDF document text
    • https://s3.amazonaws.com/filidabut/appraisal_form_216_operating_income_statement.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/76451817519.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/creep_radiohead_sheet_music.pdfIn PDF document text
    • http://virefixifefuke.epizy.com/sonatamuranujiwuzemuj.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_off0000e7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D5 5124 bytes
SHA-256: 560b7c4115c016fbcc36a6e13cfa311e46f076ab203dd53195907a53dc8ba398
font_01_sfnt_off0000f954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF954 11368 bytes
SHA-256: 3962050185638efb9e0af22f1af96d96a1c3d97a038f5c11dd497e2e6e28bd0d

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