Malicious PDF — malware analysis report

Static analysis result for SHA-256 70a4446387c2eb06…

MALICIOUS

PDF

80.9 KB Created: 2021-10-06 07:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f2aa4c9eae616f21322264990ca0c2aa SHA-1: 5fd46881676c4a0657421c64f0c6141676168daf SHA-256: 70a4446387c2eb069e7f81281a34b13d0f3fff241d6be97c82b8aac2544e5b82
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to distribute malware or conduct phishing. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=how+to+add+webcam+obs PDF link annotation
    • http://midospa.com/upload/files/19946923002.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/33132818579.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210908015229434.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/43246097423.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/51068457063.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/petelogevimezovul.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/82664849425.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/67965826806.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/xafukofuvumepewo.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/98818437987.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/34749279350.pdfIn PDF document text
    • http://halanmilk.com/upload/files/36326865014.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/pepabesik.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/3542717579.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/68208312522.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/70727606243.pdfIn PDF document text
    • http://trieuduong.com/images/Download/40051752382.pdfIn PDF document text
    • http://dongphat.net/upload/files/napudiw.pdfIn PDF document text
    • https://natinsel.com/imagenes/file/28480459622.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/sosilowefasibemizo.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/49488243021.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021092307022973499.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/97151250855.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/lozuzugewutofos.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_off0000d767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD767 10404 bytes
SHA-256: 7bbdcfdc09d39cf4003fbcb163727337b778eea585b6d4dead16f1646dbf6c3c
font_01_sfnt_off0000ef0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001071f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071F 18212 bytes
SHA-256: e27a78d633ec4d80f13ab8b538bf07a9b313bdb9d24dbbe1c260e3b6963b1f91

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