Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b087d79c1a7cad8…

MALICIOUS

PDF

160.3 KB Created: 2021-04-07 06:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 34b398918c4686cbe1acdf994d8ca9e4 SHA-1: 03b10361bb50ba68bbc33c6539fab3f0379f2da0 SHA-256: 6b087d79c1a7cad839ef25bc38456483e263c1ce7e2fd81664304ca425594459
126 Risk Score

Malware Insights

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

The PDF file is detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to suspicious PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains references to 'Toyota aqua 2015 manual english pdf' and 'wkhtmltopdf', likely a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • 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 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 http://russian-ice-spb.ru/sites/default/files/webform/files/77599308563.pdf In PDF document text
    • https://www.mainephilanthropy.org/sites/default/files/nikosomonebazi.pdfIn PDF document text
    • http://cicatsalud.com/html/sites/default/files/webform/kizosilubim.pdfIn PDF document text
    • https://www.visitsavannah.com/sites/default/files/webform/nodarinit.pdfIn PDF document text
    • https://www.a1touchsolution.nl/sites/default/files/95216779236.pdfIn PDF document text
    • https://extranet.blanchisserie-toulousaine-de-sante.com/sites/extranet.blanchisserie-toulousaine-de-sante.com/files/documents/justificatifs/29410319198.pdfIn PDF document text
    • https://www.enwidth.com/sites/default/files/webform/resumes/22435641867.pdfIn PDF document text
    • https://www.afscme65.org/system/files/webform/baxuwobokorexifiri.pdfIn PDF document text
    • https://europa-ts.ru/sites/default/files/webform/totikejeropisatuzubafaba.pdfIn PDF document text
    • http://www.muttypawsacademy.com/sites/default/files/webform/vaccines/72246142748.pdfIn PDF document text
    • http://spotlight-sites.com/sites/default/files/webform/loboje.pdfIn PDF document text
    • http://www.guninetwork.org/system/files/webform/heirri_proposals/74543186253.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=toyota+aqua+2015+manual+english+pdfPDF link annotation
    • https://ubmemeaensoprod.s3.amazonaws.com/ifsec_international/call_for_papers/2021/03/33404153997.pdfIn PDF document text
    • https://gradfutures.princeton.edu/system/files/webform/25860956451.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ed83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED83 16008 bytes
SHA-256: 3a3ef7309051ecc3b5774a4437f13d35e01f3ef0096d47a4dd2d8c0d17094d17
font_01_sfnt_off00022109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22109 5984 bytes
SHA-256: ae3f179a5ae77bcd65da978e12e97929b5fac9153e09d230821903b6e85b3d9e
font_02_sfnt_off00023559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23559 12436 bytes
SHA-256: 6b016672e77cac9e94d6584277fa2d70f20d2295c26a25198306499d9b25bd47
font_03_sfnt_off00025ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25EF5 16124 bytes
SHA-256: aac04c12c494b66c13d2278c740e9613674f111d80602992eed3beb3a8a3852f

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