Malicious PDF — malware analysis report

Static analysis result for SHA-256 702fd8be28352f61…

MALICIOUS

PDF

71.0 KB Created: 2021-09-26 12:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 15b411d7fb27755f448530e23bad423e SHA-1: 19d5bf48972543f88566a92066513c7c3171efe8 SHA-256: 702fd8be28352f616aa128c739d11c6e71cdb9eba5eb4133e15a0d7394d75304
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. The primary attack pattern involves directing users to external PDF files hosted on potentially malicious or SEO-manipulated sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://logenamerica.com/userfiles/file/6799011271.pdf In PDF document text
    • http://kyea.org/imageuploads/68938976906.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/rofirunugupididasokasotu.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c00599f95e---94859054280.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/xumopu.pdfIn PDF document text
    • https://tdfstore.it/file/linepatixofasawu.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/557769890.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/ketajeraku.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/gupibimenibewopabesu.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/kurizewijulipaludubu.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/zudixofasenagaxolax.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/deganojonezotonogura.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/69841638999.pdfIn PDF document text
    • http://freestyler.cz/img/file/6049305298.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210917_C262CE8DE193ABF2.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/tujuxokadabumuvut.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/50733986300.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/jidixefu.pdfIn PDF document text
    • http://maksimetall.ru/files/41477976817.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/q3k59e24sqf9ki8e91a115hr3i/43407908036.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/bafelejariwamum.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/mojoj.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/95617915932.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+find+deleted+photos+on+my+android+phonePDF 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_off0000afc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC1 17024 bytes
SHA-256: 66567bdb4b986d12afbdeb3b91d8838e6476a69744aa2a9489a28b85b390413c
font_01_sfnt_off0000db80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF397 10952 bytes
SHA-256: 90c7f77f9327bcdaeebbda721d8cf42eb0f6de7f3195b274d87e828bab4f9a40

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