Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a7555f426fc857…

MALICIOUS

PDF

68.9 KB Created: 2021-10-02 22:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0246fce0e312f1d8c22210f3a9e7192b SHA-1: 8127c2a3216bcf3bd151cfc08f711d3b34c71c91 SHA-256: e3a7555f426fc857c90560c48cfecc16df21e49f7ab4072c67b84baa3d971d3c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate the document functions as a link farm, containing numerous links to disposable domains, with a high number of distinct hosts. The embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or scam campaign aimed at directing users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://ecoaga.com/documentos/file/gurexigaverir.pdf In PDF document text
    • https://eravukappalpalli.com/userfiles/file/rimatejilatalawifozejokev.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/23877025274.pdfIn PDF document text
    • http://tdbm.vn/upload/files/60794227296.pdfIn PDF document text
    • https://poker-fire.de/file/suxifazarilegidewokab.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/51433633566.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/16673976732.pdfIn PDF document text
    • http://generoussecurity.com/uploads/33318113239.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/37969591257.pdfIn PDF document text
    • http://recviem.ru/img/upload/sewexipesolubazajobi.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/37858242675.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/99769367535.pdfIn PDF document text
    • http://irfanmakina.com/depo/sayfaresim/file/kunum.pdfIn PDF document text
    • http://gr-chem.com/upload/files/4129213723.pdfIn PDF document text
    • https://felixtrail.com/imagini_ws/xulejagasegabitinunefi.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210914154842.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/72011078920.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/lagemitaxu.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/mezuwiledupezitedarexa.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/pezuz.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152eb779d252---12906779265.pdfIn PDF document text
    • https://emmaushuis.org/pages/42379384787.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/22191020791.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=navy+service+stripes+yearsPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/kexotifevomexagigu.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_off0000b10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB10B 14748 bytes
SHA-256: 7aeb24b2424955cc6b484c65c779732ae69579d7469fc6da4d0156d8101d1600
font_01_sfnt_off0000d60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE23 10252 bytes
SHA-256: 15d8e7030b75463d808de5982c26f2f0459b45f8b447135f50fe823bb549a174