Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae81e3140357f36a…

MALICIOUS

PDF

71.6 KB Created: 2021-09-13 14:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 68b3c31db7a7f78cb12fc02df7c01a18 SHA-1: 9562ed7372394f84d40a186ba1c7cbccb8123d0b SHA-256: ae81e3140357f36a58de399021b96c8288043e461dbbebbcb15e2b1dccb53333
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. It contains numerous embedded URLs, one of which is presented as a lure for downloading 'amazon prime mod apk free download'. While no scripts were directly extracted, the PDF structure and the presence of external links suggest an attempt to redirect the user to a malicious site or download a secondary payload. The ML classifier's high confidence score supports this assessment.

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://frezerovka.by/images/fxeditor/file/xigidipuv.pdf In PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/rudikifoxinumovufa.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/28184451603.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/63216507215.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/nonusijivufolapewimup.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/ximukunalup.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/dofagatuf.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/wubuwibedesojusasilirim.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e1660943a---21169958866.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/lupakuduvoje.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/2799238779.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/wewujoxo.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/2427440036.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/99332413809.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/lirugujalerujomiwer.pdfIn PDF document text
    • https://panama4d.com/contents/files/37677452770.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/0da06b9102ee4e1d15c5cfecb31dec55/57052382525.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/natajaleduxawem.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45893611110.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/92267577425.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/namewisufugokulezazu.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/87815973921.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/tejadogadizeramebipinu.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/faripos.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/71251499399.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=amazon+prime+mod+apk+free+downloadPDF 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_off0000b9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD204 10612 bytes
SHA-256: eda723bef700ca00ad0ca8fb36a916c7d3cb4dacfee672e1a7c4fe64d4d1e930
font_02_sfnt_off0000ea47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA47 15236 bytes
SHA-256: 2680dd7f010136cc46cfc08fd48796a98680a3512d25ae9f1364d19d6b03e201