Malicious PDF — malware analysis report

Static analysis result for SHA-256 a81560da0f872d03…

MALICIOUS

PDF

75.5 KB Created: 2021-09-17 03:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 572918e5a5a23c58b56f7efff20967a9 SHA-1: 900e3f36785b4d69a488b1697183017729a452ad SHA-256: a81560da0f872d037e645c9db1c0910fcd837618c0903e734e0670b9876243d6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a large number of embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting a phishing or malware distribution campaign. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://krisoc.ru/uplcv?utm_term=transfer+iphone+apps+to+android PDF link annotation
    • http://studiotecnicoligioni.com/userfiles/files/42064926056.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/39417350639.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/disagaduz.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/bazupob.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/78001493540.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/87209038000.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/jukomenolulumokululuro.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/40954600517.pdfIn PDF document text
    • http://dsfly.com/uploads/files/765613060.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/puxotanagukuwuwomukob.pdfIn PDF document text
    • http://sparkpro.lv/content/file/84183762510.pdfIn PDF document text
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/lusizafikanovelunuxok.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/45158285975.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/97491388692.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/kixipemojufuwodokapazev.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/1212580828.pdfIn PDF document text
    • http://actinq.nl/upload/file/vogedanelifefovejed.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/fomisojazavoxafezedifevo.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/lirutesetagobogalumikaka.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd85238de3---47603855502.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/monirop.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109080559041283.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139f8ee4ff3c---43890594884.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_off0000c404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC404 17384 bytes
SHA-256: e87b146e680525ea66a65f5a4ac6d5bedde9535af10bc7367a2cfe5cd3b2f6f2
font_01_sfnt_off0000f098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF098 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AF 10512 bytes
SHA-256: 9258b7d1cfd3c6364031dabdfe93b03b94f691ffca77af4e254e77b39d7c323c

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