Malicious PDF — malware analysis report

Static analysis result for SHA-256 59e917842d9499d8…

MALICIOUS

PDF

78.2 KB Created: 2021-09-19 21:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 407fb98e6d1fe5f08d5679ccb46f654f SHA-1: b43e507d2096491e7939b071c937712fefbc524e SHA-256: 59e917842d9499d84ee2fd8d1103ba5035ad16ad38fbb76f4cb2c5c64f6e8a4c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The presence of numerous external URIs, many pointing to disposable domains, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dental-forum.ru/userfiles/file/73218620551.pdf In PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/neripakika.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/99029174120.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/27825502476.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/punuja.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/1489344847.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/pozurevowafufesojadi.pdfIn PDF document text
    • https://labelmarket.eu/data/file/60909790153.pdfIn PDF document text
    • http://gerocuki.hu/user/file/59400059549.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/zemedufarileredojaxelu.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/85324438534.pdfIn PDF document text
    • http://chongros.com/userData/board/file/14233263199.pdfIn PDF document text
    • https://rinducm1.com/contents/files/sotojozapu.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/tubaxi.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/35265055496.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/8091293965.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/42010991282.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/42209165600.pdfIn PDF document text
    • https://www.nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/tagobeto.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/ditaxanujezefu.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/vemelenope.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/fovugenufixumafuboji.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/87669625870.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=inshot+lite+apk+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_off0000c5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0B 10520 bytes
SHA-256: b43a142095631290cf6b040483dac8e18692d49a2c28d64942d07f8a17006195
font_02_sfnt_off0000f5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F2 20472 bytes
SHA-256: 4e5c824f5210715d308f724673e96ce0d4c003551ed3592f50eaffebf58afc27

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