Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbdd26efa239d8c6…

MALICIOUS

PDF

79.5 KB Created: 2021-03-29 00:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7d09344dcb7afa256cf735a2ee2ce925 SHA-1: c81f193855b1de7e1b9d2b5269977986965dacdd SHA-256: dbdd26efa239d8c623d92ba2dff0aa1f91defaf5d204f2c5f488dabf50c9bacb
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, including a link farm and a redirector URL, designed to lead users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The presence of embedded URLs and the overall structure suggest an attempt to exploit user trust by masquerading as a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://bologen.ru/123?utm_term=set+notation+venn+diagrams+worksheet PDF link annotation
    • https://solorebigaz.weebly.com/uploads/1/3/4/7/134707119/sadufosurowe.pdfIn PDF document text
    • https://puzomukasudugun.weebly.com/uploads/1/3/4/8/134865935/wasatulore.pdfIn PDF document text
    • https://cdn.sqhk.co/nigulavax/jhgfhio/myblock_h_r_block_usa.pdfIn PDF document text
    • https://lewumime.weebly.com/uploads/1/3/5/2/135297270/zubolu_femija.pdfIn PDF document text
    • https://cdn.sqhk.co/buweworipoza/hhiegd7/kikamekozigufewukaxev.pdfIn PDF document text
    • https://gejidodedawo.weebly.com/uploads/1/3/4/0/134018108/zisokobirisoda-tusidunivodi-gurixipotope-fomixude.pdfIn PDF document text
    • https://sefariduzaki.weebly.com/uploads/1/3/4/6/134665623/vuzaguzobus.pdfIn PDF document text
    • https://barijenevedi.weebly.com/uploads/1/3/1/4/131438420/muzawab.pdfIn PDF document text
    • https://vivorewipaxuje.weebly.com/uploads/1/3/4/3/134365477/7660841.pdfIn PDF document text
    • https://cdn.sqhk.co/xulawajikigi/9lE5hhm/new_syfy_shows_march_2020.pdfIn PDF document text
    • https://zudalutotazif.weebly.com/uploads/1/3/1/3/131379026/4365953.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/juzewojavomofew/kiloburusikova.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/master_interior_design_colleges_in_delhi.pdfIn PDF document text
    • https://s3.amazonaws.com/gimufesajo/25152477439.pdfIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/37625269331.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/inductive_and_deductive_reasoning_worksheet_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/13781843532.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/60455651163.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/crossfit_workout_calendar.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/10475904076.pdfIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/austria_visa_application_form_sample.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07D 5528 bytes
SHA-256: e3a8b18c9bd0efb40a03a5027ccf36a0013ae3def76fb8c2ce5dafd7e9e45da5
font_01_sfnt_off0000f331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF331 11700 bytes
SHA-256: 79844726b193a6e813d5672232c807a655bacb8fff1a8cbd79897f695f6f31c8
font_02_sfnt_off00011b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4D 16112 bytes
SHA-256: 366b2a3ed9b44e620159a8175e6f9935b0189d17b94b4d5ccfd5980b0b155f3e