Malicious PDF — malware analysis report

Static analysis result for SHA-256 c60d560c88d6a514…

MALICIOUS

PDF

73.7 KB Created: 2021-09-12 19:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fadf3da08646eba35f4a22570ae4a567 SHA-1: a4263b284173ed24761c6a6b5fc6bab74d1e3446 SHA-256: c60d560c88d6a5142ead21c92a25b551020488a443c8bae2332a40415a2f10d6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are part of link farms on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM further supports this. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://huntic.ru/uplcv?utm_term=speak+out+pre+intermediate+workbook+answer+key+pdf PDF link annotation
    • http://swiftnb.com/ckfinder/userfiles/files/91383637563.pdfIn PDF document text
    • https://keongracun.org/contents/files/ronumugewavugenolovinaja.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/82000346787.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/moxitat.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/54739975590.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/68826294555.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/84168244686.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/80039352734.pdfIn PDF document text
    • https://losungversorger.com/product/file/4054058002.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/78322696029.pdfIn PDF document text
    • https://agermag.ro/mm/file/divafemi.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/bonotexodovegonekabekaxar.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/notugimazedigunelibazonid.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/7355f78619bafe4e133adc9f919bebbf/lutajujuligofug.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/dumobabusimuwirexif.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/meguz.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/71854820661.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/raxanenotivegorugux.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/janowunowidevo.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/zizudajivexabef.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/kixonoperaduxixak.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/zutaserosox.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/tedalakoxarekupiwin.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://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_off0000b6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E0 11220 bytes
SHA-256: 3ddf4d8f3f614c40a701c3b33bf47533381249b106db08284846390d85fcab7e
font_01_sfnt_off0000d101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD101 18716 bytes
SHA-256: dc2f2a336ca5df5bc2bda9a40fef2ee601f454da131f03e822af3d5b9a0733cf
font_02_sfnt_off00010133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10133 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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