Malicious PDF — malware analysis report

Static analysis result for SHA-256 79df89622d8eacf7…

MALICIOUS

PDF

76.5 KB Created: 2021-03-24 14:51:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a7ab139eb15a758c762aca9804c73e7c SHA-1: 24ff75ee7c9a865bfbc0f7ff46f1233de9c9580b SHA-256: 79df89622d8eacf77b722f5bb6a5f54e2f28f3870409fe6dcbac51860bbab4cd
156 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier, with heuristics indicating it contains a large number of external links, potentially forming a link farm. The embedded URLs suggest a lure related to 'arcsight cef pdf', possibly to trick users into downloading further malicious content. No scripts were extracted, but the PDF structure and numerous external links point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://dugedepap.ru/award?keyword=arcsight+cef+pdf PDF link annotation
    • https://kuwupixunipava.weebly.com/uploads/1/3/3/9/133986845/bemuwiru.pdfIn PDF document text
    • https://banafazag.weebly.com/uploads/1/3/4/3/134325205/natuwexululuveko.pdfIn PDF document text
    • https://fozabezadako.weebly.com/uploads/1/3/4/6/134639332/xatepudevuzumud-vixame.pdfIn PDF document text
    • http://sezituza.66ghz.com/fidanovimepitu.pdfIn PDF document text
    • http://tortomsk.ru/digital_logic_design_tutorialspointgr51s.pdfIn PDF document text
    • https://peziwotikiju.weebly.com/uploads/1/3/4/6/134602895/b6ebbd0.pdfIn PDF document text
    • http://form-lnstagramcopyrightservices.com/xekojoboseru536bw.pdfIn PDF document text
    • https://funofumid.weebly.com/uploads/1/3/4/8/134886651/5914427.pdfIn PDF document text
    • https://lefonoduri.weebly.com/uploads/1/3/5/3/135324857/dizup.pdfIn PDF document text
    • http://rankingcoach-apps.com/how_to_stretch_out_strappy_sandals_for_wide_feet1j8zx.pdfIn PDF document text
    • https://letavozogat.weebly.com/uploads/1/3/5/9/135978758/vewijidarasisu_zepexod.pdfIn PDF document text
    • https://wisiwojapano.weebly.com/uploads/1/3/4/8/134896472/todivowaruxo.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/kovezux/48800117228.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/welding_skills_workbook_fifth_edition_answer_key.pdfIn PDF document text
    • http://wovowevajob.rf.gd/971229017.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/web_designer_resume_template_free.pdfIn PDF document text
    • http://zofawuzimiva.rf.gd/architecture_101_book.pdfIn PDF document text
    • http://wuxipiropamamoz.epizy.com/36118691290.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/vitonememominazot.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/how_to_turn_on_big_blue_party_speaker.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/10548174983.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/97947703004.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_off0000ecb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB2 5164 bytes
SHA-256: 3fff8dba7797312e590d4c93ebb7f53ea040b54e85c235ca84b09c3171eed152
font_01_sfnt_off0000fe48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE48 11344 bytes
SHA-256: 7f1a8a04a98a03e07e118bdb1476368b66feda784b1fa8fc3c9731bfd57dc76a

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