Malicious PDF — malware analysis report

Static analysis result for SHA-256 d715c00ee431240d…

MALICIOUS

PDF

77.3 KB Created: 2021-06-05 02:40:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0a138c3b3c0b81a1a9a3a59b07b725c2 SHA-1: 46c12c8ef555186b20f02b29e339a99835359f51 SHA-256: d715c00ee431240d388c181e341e4e4c0a4728642bdf3a0386277e1a12dbbf25
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://chcial.ru/pbw?utm_term=how+to+upgrade+disk+drill+for+free PDF link annotation
    • https://dibikavo.weebly.com/uploads/1/3/0/7/130738915/4379381.pdfIn PDF document text
    • https://rafukamilijodif.weebly.com/uploads/1/3/7/5/137509327/7249127.pdfIn PDF document text
    • https://sefenavimeta.weebly.com/uploads/1/3/4/8/134885596/165c99046a0a570.pdfIn PDF document text
    • https://sunivisoxeban.weebly.com/uploads/1/3/4/4/134493344/rutulobedaloden_viruzakom_pepesevatusiw.pdfIn PDF document text
    • https://wufaderafezika.weebly.com/uploads/1/3/0/7/130776219/74e499d711.pdfIn PDF document text
    • https://tatuxosigataban.weebly.com/uploads/1/3/4/7/134770737/jufaludex_fuzudumifoz_jikuxuzejefafek_fozigusoxu.pdfIn PDF document text
    • https://mematuseb.weebly.com/uploads/1/3/4/5/134516495/cb4a31124.pdfIn PDF document text
    • https://zegekeli.weebly.com/uploads/1/3/4/6/134616407/7336be02e67c28.pdfIn PDF document text
    • https://gekowodi.weebly.com/uploads/1/3/5/3/135321574/bcd95.pdfIn PDF document text
    • https://wipiwabe.weebly.com/uploads/1/3/4/4/134438476/xamogilos_pegarujenu_dosevinaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gogoporiwo.pbworks.com/f/bobogobemekafigizu.pdfIn PDF document text
    • http://ruwomodanom.pbworks.com/w/file/fetch/144445422/radodebula.pdfIn PDF document text
    • http://fufitiruw.pbworks.com/f/gumowafujugudasolapu.pdfIn PDF document text
    • http://xuwajesorewo.pbworks.com/w/file/fetch/144630678/college_physics_a_strategic_approach_2nd_edition_solutions_manual.pdfIn PDF document text
    • http://gepefupugalu.pbworks.com/f/rockschool_guitar_grade_1_free_download.pdfIn PDF document text
    • http://fokopaviwu.pbworks.com/w/file/fetch/144568029/98710503158.pdfIn PDF document text
    • http://zupelapowi.pbworks.com/f/rorolewimofijenufuje.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_off0000f13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13E 5328 bytes
SHA-256: b1eef04e7cfe72bf3cd6b1d539d18a517b264dc57c0d26fb3737d0443f8c4053
font_01_sfnt_off00010381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10381 10856 bytes
SHA-256: d3fb08edbfbaf966bcc5e4fe6193d3cc86e719f1bafe02a5337212975e77e327

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