Malicious PDF — malware analysis report

Static analysis result for SHA-256 953b137491dfe624…

MALICIOUS

PDF

90.6 KB Created: 2021-09-19 15:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 760f9b9775f11ce160017285eab0b4cf SHA-1: beab8af564018be8a0348bd9ce8499a5588b4ad1 SHA-256: 953b137491dfe6249fdda5d7f801f12d7b819f36c59b92dcb5a2f48bbaa4240e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous external URIs, many hosted on disposable domains. While no scripts were explicitly extracted, the PDF structure and the presence of numerous embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://habibitours.com/ckfinder/userfiles/files/33951982132.pdf In PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/nazekafuviruwizuxetixaram.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/didizupumararo.pdfIn PDF document text
    • http://mp-journal.com/media/file/62662361642.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/zariva.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/3dbd8622a96bd5518fac991e8da9f04b/zosugijidonefosesaregam.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/98625751394.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/pibefiramonidoxixireporib.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466102ebacc---bifagusifazedufeg.pdfIn PDF document text
    • https://kawanmto.org/contents/files/duzave.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/70640844177.pdfIn PDF document text
    • http://nineslash.com/user_file/file/36163101754.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-13/20210913191903926686.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/romifupusozaxolujubuji.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/64037892920.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/gujizetuk.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/pojorujokereduxawut.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/vagedotuk.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/66314063314.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/daxoxuxiwes.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/63888898292.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/54495527611.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/zupubanolaxuki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=call+recorder+apk+2020PDF 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_off0000fe23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE23 10412 bytes
SHA-256: e3b683e1ffe4d8bd7bd3995ae96678fae76783a68e64de4891a876bef96be6dd
font_01_sfnt_off000115da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DA 18180 bytes
SHA-256: 6fb295025a9928187460b04b42abfe8611f538fdfcb9e90d75c8ec7a341d6368
font_02_sfnt_off0001451c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1451C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1