Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae62a722c58bd98…

MALICIOUS

PDF

68.4 KB Created: 2021-09-26 11:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7f4b889a8f17d59a64738d31e0444449 SHA-1: 419d6fddcf5669bf507a971dcee02084de96adc1 SHA-256: cae62a722c58bd980e39ec52bb0c959a2324d580ef2b4403682b1e38af0c1999
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF with a high ML classifier score and ClamAV detection indicating maliciousness. It contains numerous embedded URLs, with one pointing to a suspicious PDF hosted on a website that appears to be part of a link farm. The PDF's document body is heavily obfuscated, preventing a clear understanding of its direct intent, but the presence of many links and the overall detection suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1613b31b2a5893---6635844246.pdf In PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/39806559189.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/kiburovisigazunetumene.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/lewisobofofifu.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/80117785339.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/jasitejosobabe.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/kugomiliguxuvixikanirek.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/gawudeluzixigebukolagajix.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/52159736705.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/difasenulotapilanan.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-2/20210902110256497931.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/poliganekonugale.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/lisakon.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/zufutu.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614f5394aca2c---23999115316.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/xunepememefasukabubatoger.pdfIn PDF document text
    • https://equinox-e.com/upload/files/24301513784.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/59659600787.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/fimupipigowexefa.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/mazufigurozakesowov.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/lirujirerusuvifaje.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/kutov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=nonton+a+quiet+placePDF 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_off0000ad25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD25 16020 bytes
SHA-256: 721163bff7b6f6a5a1269edba4dd988c14132fe45d4311a81c9824358da072c7
font_01_sfnt_off0000d539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD539 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED50 10324 bytes
SHA-256: 7724389a60bf7bac0643f20bf5cda77122884f6da4be88f7cc6fcb653278e2f8

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