Malicious PDF — malware analysis report

Static analysis result for SHA-256 11423b14103e4810…

MALICIOUS

PDF

80.4 KB Created: 2021-10-04 02:38:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9de939713ccf85c7ea9f632d603881a7 SHA-1: 6d919a438bf16560b9fe6568121020d0aa90ac2b SHA-256: 11423b14103e4810ea1e19582943577c84c0e0eae22a6e1bb1024ab464a0a108
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content or exploits. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host numerous links to external sites, a common tactic for phishing or distributing further malware. The embedded URLs, while many are unknown, contribute to this pattern of redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9762

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 http://delta-serwis.pl/pliki/68057139325.pdf In PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/bb3026068e3604a06d1b001b2533e216/regilazidifabozijigom.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/notegeveneta.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/tonemalugateket.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/gupojirez.pdfIn PDF document text
    • http://saint-party.com/media/file/voxof.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/nazowugifidetulu.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210917_4F03798B394A8879.pdfIn PDF document text
    • http://szjg.hu/images/file/45968019716.pdfIn PDF document text
    • http://guchen.ru/d/files/kewuwivedug.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/zizobutobes.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/reparazalobulu.pdfIn PDF document text
    • http://asfalon.com/__files/file/48370737346.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/tapoterigevebav.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/tuxogukiso.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/47922147701.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/gurugosiwotilawarok.pdfIn PDF document text
    • https://maturana.cl/upload/file/dirusatarurolorilara.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/43379419192.pdfIn PDF document text
    • http://dsraxys.com/uploads/veguzo.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/60301733933.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/16485097893.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/23459520346.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/nosep.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/95764293466.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614eec44140ff---pujepukogu.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/fivapabaruwobavuki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=first+touch+soccer+apk+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000baa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAA8 10864 bytes
SHA-256: f558ed17e314f9a5d62c972c075cf269493f48b3a6893b5ea6a56f1f8b98cb33
font_01_sfnt_off0000d3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C4 16188 bytes
SHA-256: 800554d3d6320da9c8ab21a3ad3d270f40e7a92360d7538c059d647d952d1d34
font_02_sfnt_off0000e976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE976 18964 bytes
SHA-256: 97a486400699dfa84c83d3d28dd5e1ed8080a8e294094939f216df1998353c1e
font_03_sfnt_off00011ac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1