Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d9281dfb5e680ed…

MALICIOUS

PDF

78.3 KB Created: 2021-09-12 20:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 2fe7c9076cf05868f2d3f0829adaf151 SHA-1: cd4d27daf8fc7f62391b7050875186f621c75da9 SHA-256: 1d9281dfb5e680edb0bd24c680c1a7e7c7a8ec9f8c76e1688e863d31233c4a0c
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://okvin.org/userfiles/file/dasutipesun.pdf In PDF document text
    • http://lsphc.com/userfiles/file///66057261188.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/noviserejozukaw.pdfIn PDF document text
    • https://mmszke.hu/files/file/nofupilum.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210831232014.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/19379350151.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/lilevob.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/redutonajuvewanixotu.pdfIn PDF document text
    • http://nfc.soo.jp/file/63305513808.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/57843635726.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/powusevo.pdfIn PDF document text
    • https://novitas.ro/files/zoxofuralovenopogikes.pdfIn PDF document text
    • http://lachina.cn/upload/file/ganonaxemobesim.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/puxebikesumenujimutigi.pdfIn PDF document text
    • https://coluer.ir/documents/file/24022795920.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/puxuwosabixakikilusob.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/barowalixomewoxepororinu.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/boputisodujagibuvajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=los+angeles+crime+android+gamePDF 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_off0000cd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6E 10572 bytes
SHA-256: 92ab297e749facd13a96922a2d9b9d14c4274dfe19df40748fa583918a9a7f7a
font_01_sfnt_off0000e540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE540 17924 bytes
SHA-256: 213d6b11b1cda603593e10b1fd0b3f5a22852bc7f01da406e6871b8bf0092b6e
font_02_sfnt_off000113fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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