Malicious PDF — malware analysis report

Static analysis result for SHA-256 681358cf1b3c2659…

MALICIOUS

PDF

73.3 KB Created: 2021-10-03 19:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 67c3ca6ad6e457befe96df3038da0611 SHA-1: 2d57bdbf54915ebaea39291bf70bfcb9888074e4 SHA-256: 681358cf1b3c26599ce52d058f827783efe9a9fe55862688c2759d4bbb5dc137
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicating it functions as a link farm, likely to direct users to malicious sites. The document body is heavily obfuscated, preventing analysis of specific lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/ba50705496389819a5788c623e3a0ba7/17175833525.pdf In PDF document text
    • http://dhf-china.com/d/files/kofalozilifodixuramawa.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/nexal.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/poseduxokipusalinat.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/rizuluwotozutidoz.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/birudarawiveduluvamuzel.pdfIn PDF document text
    • http://expresskaliski.info/file/zuvefebumaxaxojizepixaj.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/mexomegejakerebolipu.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/72100783011.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148337fe03f6---dakaxakexasawuxafelar.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/67355094299.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/45200714686.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/dutudelifepudiwebanonora.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/kaxenufedufokizibe.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/50398273713.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/63737286706.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/58671385643.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/66249873416.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/kapawadigesuwoxu.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210927180729.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/fulogubepina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=difference+between+cyclic+phosphorylation+and+non+cyclic+phosphorylationPDF link annotation
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB69E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ceb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB5 11060 bytes
SHA-256: 25470fb364db112c193599e3c834d4d1356f3b592a8669b382d7df7c04a3837e
font_02_sfnt_off0000e845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE845 18020 bytes
SHA-256: 168316dc7e1bf7e9373270ec037141c39eec773b5924ecfacc2944d9d4bead8f

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