Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7a975b4ae70fff8…

MALICIOUS

PDF

81.1 KB Created: 2021-09-12 01:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 39e942f7bbb0f584e2210874180262aa SHA-1: 2d9ed2e9b6c9890c35ecdcc826bd016f44960878 SHA-256: e7a975b4ae70fff8e1d1090a32cb1340e6164533fea18675c81c579a65978745
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by an ML classifier and contains numerous external URLs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host many links on disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs further supports this, as they likely lead to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 4

  • 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://crysiq.ru/uplcv?utm_term=messenger+apk+download+for+android PDF link annotation
    • http://baodieptailor.com/uploads/2021-09-08/images/files/64464815018.pdfIn PDF document text
    • https://aildf.in/userfiles/file/giluxivilezagepil.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/fakuraf.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/suduxub.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/93220148458.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/64681492208.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/93752426745.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/suligekixiruvilawituwe.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/pebenedemarobaxewem.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/72582199956.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/maxogabufosabekanoxeto.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109031359416518.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136792e04cd8---sulegaxuwufopurimed.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/zuxeterujumo.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/ragefemivipifinoteneni.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/wakidimojo.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/68389954727.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210902125152.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/tosirutebepojenofos.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/bukenexufodirobaparug.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/78025950652.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132547a21bf5---demovupibufenusu.pdfIn PDF document text
    • http://tochuchoinghi.org/files/liwijepukobaxebopesi.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/48978455373.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_off0000dbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DD 16384 bytes
SHA-256: 7c464da420d241fd827ee2f667dd77b98b6edd8bd8913cb57dfe88f7b1f28a9c
font_02_sfnt_off00011df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF0 10744 bytes
SHA-256: a5699a9ff3a9ec5857f3043f10fde1120a250e12ba2ef3297b9718dc35c6c887

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