Malicious PDF — malware analysis report

Static analysis result for SHA-256 f177254a056c0587…

MALICIOUS

PDF

82.0 KB Created: 2021-09-21 07:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 468dd0c17df1174da5c93e4384889ab7 SHA-1: 68daf314f74cee5f3ebc6f8c3e2eb722d2f53740 SHA-256: f177254a056c0587aa19bbf6dbe8b9fd9ce04502bb6c1fe8ae8414563ffc3b8c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to numerous other PDF files hosted on disposable domains. While no scripts were explicitly extracted, the PDF structure and the nature of the embedded URLs suggest an attempt to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://unewstoday.com/task/userimages/file/wiwafonanarule.pdf In PDF document text
    • http://moderncarrent.com/user_img/files/zapididem.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/93098847499.pdfIn PDF document text
    • http://linza-market.ru/upload/files/649874398.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/gefolarugagamenojurelidu.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/74492832832.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/samagikuvo.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/pogekejumazu.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/24492520851.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/57586884420.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/94369177993.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/zedobavi.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/pozegadalozivakewofu.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/bonugenezepoxa.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/32303231735.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/35228140208.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/basitodowon.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/31771594039.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/67969597154.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/63499288479.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/43171117813.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210906045254_eph5yl.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/mineferegesazesixawitiru.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210905185140.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161484f4d0d3a1---kililafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=fachat+coins+hack+apkPDF 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_off0000db98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB98 10260 bytes
SHA-256: d126ea40006da4870a01a96b12e06c67906626b532e0b17a89da7fa33c87ba58
font_01_sfnt_off0000f2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB4 18028 bytes
SHA-256: c34a89b6836fa283c00dd8b0bc08a10d75c5e7d85f91aa67fe8eedeaca962dd1

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