Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c3dbc3ebedad2e…

MALICIOUS

PDF

70.3 KB Created: 2021-09-24 19:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7ff37b8213cacb3d67d54f80dec62537 SHA-1: 11bb7294b0621f2fc111d3940a559abda0a4b063 SHA-256: e7c3dbc3ebedad2eb9f99709fab85ec1d68394f8c3f130b48ae109f4b12c2f9c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It includes numerous external URIs, one of which, 'https://pixomot.ru/uplcv?utm_term=play+store+app+download+apk', suggests a lure related to app downloads. The PDF's structure and the presence of JavaScript indicate it's designed to exploit vulnerabilities or trick the user into executing malicious code, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 https://pixomot.ru/uplcv?utm_term=play+store+app+download+apk PDF link annotation
    • http://voszveszprem.hu/_user/file/vuludobad.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/88563965146.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/tosapifinugugo.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/29604351611.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/63786465819.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/josazasiguked.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/40890878699.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/puxanafufe.pdfIn PDF document text
    • http://rsentco.com/upload/file/pukedogesagirixepojoxazo.pdfIn PDF document text
    • http://c2r.su/uploadfiles/file/2021091400375673499.pdfIn PDF document text
    • http://hk-keber.de/images/file/wosaxasupofabu.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/52510551154.pdfIn PDF document text
    • http://gskrem.ru/img/file/jewadejadaxumovalonodifu.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/fukivofogup.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/xoredok.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/fanipa.pdfIn PDF document text
    • http://chipmax.in/chipmax/ckfinder/userfiles/files/56324849110.pdfIn PDF document text
    • https://reha.bg/content/upload/file/55251454760.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/tiled.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/debav.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/kolifotoruloka.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/lulinevapusebosisiwimepo.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/88016170073.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/25967256097.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/93212809265.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/foloxovevu.pdfIn PDF document text
    • 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_off0000b3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B5 10588 bytes
SHA-256: d10c92c5e678a7e4ade6868b77e0ad96a719061446945cd8d1e2e5276f2cc19c
font_01_sfnt_off0000cc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43F 15396 bytes
SHA-256: 71ae0b3b94549abb7e160b9b1288cfcb40fda4ae88b7d5b73ed1d7a0e9193528

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