Malicious PDF — malware analysis report

Static analysis result for SHA-256 792cf4504ddef36d…

MALICIOUS

PDF

90.0 KB Created: 2021-02-25 10:09:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1effeefdc064abe66483d5a6d40e13a9 SHA-1: 4e743fa135b05b63dd1c5f62ee93ca5daceccafc SHA-256: 792cf4504ddef36d7e526d8a681b4547c4afe15c9ef274049394a15c72abb208
126 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 0.9997

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 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://leonvi.ru/aws?utm_term=smart+watch+phone+user+guide+manual+em+portugues PDF link annotation
    • http://frukt.space/farmacologia_odontologica_librosb377h.pdfIn PDF document text
    • http://fb-copyright-help-from.com/bawilejefiwukulufizii2fxc.pdfIn PDF document text
    • http://santand-es.com/mens_medium_hairstyles_for_thick_wavy_hairojx4z.pdfIn PDF document text
    • https://gikanusubidi.weebly.com/uploads/1/3/4/7/134756500/4618946.pdfIn PDF document text
    • https://visofebofoxofub.weebly.com/uploads/1/3/0/8/130814652/5599723.pdfIn PDF document text
    • http://domsale.xyz/online_spoken_english_booksf98if.pdfIn PDF document text
    • https://vatedubajepe.weebly.com/uploads/1/3/4/3/134371970/vekawik-leliverimijeg.pdfIn PDF document text
    • http://unlockdeals.shop/736143290928m4y6.pdfIn PDF document text
    • https://porukugo.weebly.com/uploads/1/3/1/3/131380087/jujurujafubox.pdfIn PDF document text
    • http://damvglaz0.xyz/ramapir_mp3_song_downloadt926l.pdfIn PDF document text
    • http://avit0.pro/what_is_gods_kingdompwt4r.pdfIn PDF document text
    • http://teleporttur.ru/nosisedafasorabogago37yoa.pdfIn PDF document text
    • http://maska-respirator.com/fifeviso03o75.pdfIn PDF document text
    • http://my-favshop.online/8051988564405lm8.pdfIn PDF document text
    • http://fakts.design/fedemalariki753ck.pdfIn PDF document text
    • http://netewe8.xyz/onlinemeded_quick_tables_download_frbvqvi.pdfIn PDF document text
    • https://kazowutulegopos.weebly.com/uploads/1/3/5/3/135324393/9125436.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/xovekolamoxe/69705093202.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/lufutubuger.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001124d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124D 3124 bytes
SHA-256: af118c9d2d66a992233613c12d7efa62834775fd0260cd4d1d6c688044fc3633
font_01_sfnt_off00011d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6C 5680 bytes
SHA-256: 24d6339a06eeb5cce4a1f0f84833e853a287775d86f757d50fc72bca90461fc3
font_02_sfnt_off000130a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A5 12492 bytes
SHA-256: 7a8f4430f9f1375f1055a2a3c306adaa8ceb274a4b5023142f42d277fb55f028

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