Malicious PDF — malware analysis report

Static analysis result for SHA-256 635f16226e418852…

MALICIOUS

PDF

79.5 KB Created: 2021-09-14 14:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a831535161ec6f9338d972c42aa610fb SHA-1: fc0c20959b6f1cb8e63743261c9b04dca1ecf6d7 SHA-256: 635f16226e41885255a31fb81695251b485a70aa61007048066e4480c17083b7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. The presence of embedded URLs and the PDF structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://archism.ru/uplcv?utm_term=android+resize+image+for+email PDF link annotation
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/64544932914.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/gerakigevujeruvu.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/mijumopizon.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-9/20210909135253568142.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/50940517359.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/43072374333.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/duwafodisogoxifopulotez.pdfIn PDF document text
    • https://panoramamall.bg/ckeditor/ckfinder/userfiles/files/26853668064.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/96416637929.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/3017379966.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/90802918556.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f6c1cb7c6---rizudibixuxo.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366ff404019---xexakog.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210906061036.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/xezolokefimox.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/wufiroxom.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/liluw.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090401361027.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/67829489069.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/41245600829.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/zitofujazima.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_off0000d27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA90 17520 bytes
SHA-256: 2d1e9569a6084ac33d50b97d0bfaf5b737fd5a6ac0f69e6fc69161de4c4a39ef
font_02_sfnt_off0001181f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181F 10640 bytes
SHA-256: 89bbfb0f7f00b27a28aaba14c97618c9027799124bf14f178f918fff5695bd1d

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