Malicious PDF — malware analysis report

Static analysis result for SHA-256 408cc421ad30df0b…

MALICIOUS

PDF

73.5 KB Created: 2021-03-24 06:46:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a310c3725110a30848668a2b8bb9fb46 SHA-1: 104260ef91d7d1da311d07cffaa754514f8b6324 SHA-256: 408cc421ad30df0b58b62ee7dce81accd59b2d914eec2b89aef37ef2b31c9509
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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://kuzutuzo.ru/123?utm_term=divination+with+playing+cards+pdf PDF link annotation
    • http://20970907.net/map_of_ukraine_with_citieswl5zf.pdfIn PDF document text
    • https://kumobavubisu.weebly.com/uploads/1/3/0/7/130775432/1000412.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376602/normal_5ff671ea38b90.pdfIn PDF document text
    • https://tipowunukal.weebly.com/uploads/1/3/4/3/134355136/zijagewusegadur-rexun-fitukatafevu.pdfIn PDF document text
    • https://vegonivi.weebly.com/uploads/1/3/5/9/135986737/fipuxunojipurinotivi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370746/normal_5fd6368935d96.pdfIn PDF document text
    • https://zivibesojosilit.weebly.com/uploads/1/3/5/3/135304262/botafewobif.pdfIn PDF document text
    • https://rumefonurotu.weebly.com/uploads/1/3/0/7/130740232/womexabazozapav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414341/normal_6009f5a3264ac.pdfIn PDF document text
    • http://purpless.vip/pakifinikevafirolifu7cd9e.pdfIn PDF document text
    • https://zomafada.weebly.com/uploads/1/3/4/7/134772300/zivaworakeris.pdfIn PDF document text
    • https://tesajezu.weebly.com/uploads/1/3/1/4/131452821/28005.pdfIn PDF document text
    • https://napuximijagebi.weebly.com/uploads/1/3/4/7/134766840/d5ed8e20682.pdfIn PDF document text
    • https://vusejamujaled.weebly.com/uploads/1/3/1/4/131437056/7104867.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/pezofut/rudram_lyrics_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/resumen_de_romeo_y_julieta_por_capitulos.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_off0000cc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC26 5668 bytes
SHA-256: 944f67baf2c41cb91ccec3336199621e9fdb016fe685c9a5b91d008f4cd00629
font_01_sfnt_off0000df90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF90 10520 bytes
SHA-256: 4ba9522668d7c055d2b2db5a06cdd5a6cb6d7d07d6105332415e621412fc9833
font_02_sfnt_off000103bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BF 16132 bytes
SHA-256: 267fa55b14ef4cf900efb316cf3a679441c5cb47c67db7c400ecf172ea91784f

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