Malicious PDF — malware analysis report

Static analysis result for SHA-256 375bc51b333923c1…

MALICIOUS

PDF

80.1 KB Created: 2021-09-08 23:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: fa303afada169b8b9862b9573ac3f1d3 SHA-1: 35550589187a229b0a4b2a1447fdd33ee28fb03d SHA-256: 375bc51b333923c1aa18357ac70d360702834a521499553306931cb96a9dd837
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a LOLBin command-execution lure. 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 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://drafthe.ru/uplcv?utm_term=nexus+7+update+android+9 PDF link annotation
    • https://otterdisplay.com/userfiles/file/majubujixuvegaf.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/44232216703.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/divaloralokuki.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/92622069258.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/pidenuvubowawikanigironi.pdfIn PDF document text
    • http://rcot.by/pics/files/bajazimomonegomusulamumu.pdfIn PDF document text
    • http://piscesappliances.com/userfiles/file/kirumup.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/3487116903.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/joruk.pdfIn PDF document text
    • http://lse.hu/userfiles/file/teputane.pdfIn PDF document text
    • https://kimcert.org/E/file/22421492423.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/nasipizumelilugudibifako.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/selakirarajojubepifem.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/92250699599.pdfIn PDF document text
    • http://tulga.ru/editor/files/mujuxe.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/kuwezawonafob.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/redunogese.pdfIn PDF document text
    • http://talesma.com/E/file/xilik.pdfIn macro / runtime command snippet
    • http://ricettebiagi.it/uploads/assets/file/62258175539.pdfIn macro / runtime command snippet
    • http://thepokewave.com/uploads/files/13750523224.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/dofekokavimexorasalavuli.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/xeziwuve.pdfIn PDF document text
    • http://aviatechinformIn macro / runtime command snippet
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77D 19124 bytes
SHA-256: 7509ef39904ec946448e0039ea2792026fee0c0d27b07801b05423c3e1029a25
font_02_sfnt_off00011a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A70 10736 bytes
SHA-256: 498c33fb0f95470bc1b274dad31c837dc25abdf112d89b22bbc05af60791a17e

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