Malicious PDF — malware analysis report

Static analysis result for SHA-256 be61abc3208df976…

MALICIOUS

PDF

84.4 KB Created: 2021-09-12 02:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f87b08b5c6a78fe30ce9d290dd1e1e0b SHA-1: 37c5e6b85aae6b763b7fd22df23206cb17b7a6dd SHA-256: be61abc3208df976807e18b20451b61ded034e4c4dc4cc71921111aafb95f149
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by heuristics as a link farm and a potential phishing/malicious document. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, likely for malware distribution or phishing, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mosallaesf.ir/uploads/ck/files/tavojidutavogejuzil.pdf In PDF document text
    • https://girisimhaber.com/uploads/file/fedide.pdfIn PDF document text
    • http://exms.fr/sites/default/files/file/reminivunemasesuker.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/tupuzoxuf.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/37004074203.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210904_9820E3187FC49886.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/70991163793.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/16072199330.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/niguragizabise.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/74012559119.pdfIn PDF document text
    • http://airfa.it/userfiles/file/24280406063.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/8832079757.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210911190333_zm2kxw.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/jolulomixipugosome.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/tulizep.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/3929073937.pdfIn PDF document text
    • http://bresky.cz/res/file/7127513475.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1e43d9a2a---gopasiware.pdfIn PDF document text
    • http://vucert.vn/uploads/files/puzetujugi.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613237dae0f22---ponofowuwaxobumo.pdfIn PDF document text
    • http://www.og2c.com/images/file/tukugasarikogoxedupazib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=dragon+city+hackedPDF 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_off0000e551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE551 18088 bytes
SHA-256: f94b67638d28a39d744aeaa3f012c11a4ee6e3cb5c656f6c1f70b59fcb958519
font_01_sfnt_off0001140d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C24 10644 bytes
SHA-256: fe83418258d9b71d7c0c79f86d5f478786e24e667ea79917b039de3c8453ebab