Malicious PDF — malware analysis report

Static analysis result for SHA-256 272aca70346c42b0…

MALICIOUS

PDF

77.7 KB Created: 2021-09-12 22:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3262866c4bd711c253a19ddfe827ba98 SHA-1: 8b1d1906b272084c196c43702189bec369b4fd44 SHA-256: 272aca70346c42b07a285d15761367757371bec5e5c372a39f4d06f1886c7d0f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable or unknown domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the presence of numerous external links and the ML detection indicate a likely attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9668040206.pdf In PDF document text
    • http://shopabrang.com/images/files/juwixapukaduja.pdfIn PDF document text
    • http://bostoncake888.com/UserFiles/files/dexupifiwokobewuxiketunav.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/84823584846.pdfIn PDF document text
    • https://el-tall.pl/pics/file/gevux.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/25804277777.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/19172480865.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/63054951942.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/62148605984.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210905150328.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/mevajojojikasafigajowuf.pdfIn PDF document text
    • http://china-miyaco.com/img/file/2021911195722.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///rajapiran.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/57930277882.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210902155738.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/konijutigowun.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311f55703fe---zebolap.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/49105304355.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/70532031487.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/wosoxix.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/56397554990.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dexedumexudawinozep.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/mawamer.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/55563647121.pdfIn PDF document text
    • http://superazs.ru/images/news/file/20382172098.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=justice+league+for+autumnPDF 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_off0000c998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC998 17972 bytes
SHA-256: e6d4c5c65683481f95824234900d0a6343d546f9036170045eeddff1211a8717
font_01_sfnt_off0000f82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82A 10768 bytes
SHA-256: 5db2cc240ed715f97ce99c79f0b125c85da1b5fa8c4c121e4b896c4b179696dc
font_02_sfnt_off00011106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11106 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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