Malicious PDF — malware analysis report

Static analysis result for SHA-256 63a635e74b6a3d11…

MALICIOUS

PDF

78.1 KB Created: 2021-03-04 21:01:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 37fb70091a9519156442774d0dd75e0a SHA-1: f426f8d055cbb1d2ac3273d4917128eda118878f SHA-256: 63a635e74b6a3d1192e80d7d0194c0223b41c6a534e28fc89a5253cb461a146a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' pointing to 30 external PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malicious content. No scripts were extracted, but the presence of embedded URLs and the link farm suggest a phishing or SEO spam attack pattern.

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=zte+z233vl+tracfone+walmart PDF link annotation
    • https://rifakinuzofu.weebly.com/uploads/1/3/0/8/130815009/8d1607e3e2532f.pdfIn PDF document text
    • https://milanesove.weebly.com/uploads/1/3/1/3/131383497/zidiwaf_limegusirewig.pdfIn PDF document text
    • http://pop-marketplace.ru/zesenedie2nf4.pdfIn PDF document text
    • https://belanuxaru.weebly.com/uploads/1/3/4/6/134670531/jawivabogomutadaned.pdfIn PDF document text
    • http://tikovg.xyz/the_culture_map_erin_meyer_summaryssaqr.pdfIn PDF document text
    • https://lewotivegil.weebly.com/uploads/1/3/4/3/134320996/c5fad2051.pdfIn PDF document text
    • http://takojebuti.iblogger.org/biret.pdfIn PDF document text
    • https://degusatujetuz.weebly.com/uploads/1/3/0/8/130813325/zibutivujufiwovizulo.pdfIn PDF document text
    • https://bozuwosumexoxal.weebly.com/uploads/1/3/2/6/132682772/duwufufudamiki_joruzigewo_nogemelipa_ratalone.pdfIn PDF document text
    • https://xuvamedinomu.weebly.com/uploads/1/3/5/3/135392700/c522621efcba7b.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/zinudipir/52816853582.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/blower_fan_design.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/42436695215.pdfIn PDF document text
    • http://vamovatalugoja.epizy.com/66601501814.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/traffic_report_m5_southbound_bristol.pdfIn PDF document text
    • http://wafubarig.epizy.com/7512500830.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/30058109312.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/prophet_muhammad_99_names_of_rasool_allah_with_urdu_meaning.pdfIn PDF document text
    • http://vebaxabono.epizy.com/36896054740.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/international_paints_interzone_954_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/free_bossa_nova_guitar_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/poxatakakaso.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_off0000f3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FE 5304 bytes
SHA-256: 1da3ec425a9a22ba6528947256ae927b1a9ccdde003592885b58c719de3ab733
font_01_sfnt_off00010614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10614 11168 bytes
SHA-256: 148c90eaed323825cb3b0d8dca044d1006630b68e658fe838a4bc59c871d9100

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