Malicious PDF — malware analysis report

Static analysis result for SHA-256 d68ee411651ed4c3…

MALICIOUS

PDF

91.3 KB Created: 2021-09-12 11:36:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e09c2b3d8eaf507f64bb3b3614bc7d17 SHA-1: d95f1d95db7c62f87dc2fcda6cd0e49cfac7f091 SHA-256: d68ee411651ed4c35d660d2cf04b5e78b0b67616c7cff0027ac32e58d7c93069
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to host a large number of links, likely for SEO manipulation or to distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

Heuristics 5

  • 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.
  • 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://imihwa.com/uploads/image/20210904/files/20210904023607.pdf In PDF document text
    • http://dermalab.pl/userfiles/file/kerexofijaw.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/xefukitojatosalomotu.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/89260318095.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/1935081995.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/33707850435.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/pexajeponibiposubukurufam.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/desezidanom.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/rafexixezuwerizigepaw.pdfIn PDF document text
    • http://imoroz.by/upload/file/sozogapemevowuxerupi.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/tikuwimitezidule.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/resotevutixip.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/28495491489.pdfIn PDF document text
    • http://salespate.com/userfiles/file/57795741547.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/murafudi.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/90466219620.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/83587924357.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/57559301674.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/72964969167.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fabeab46fb---soxeravakozited.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/78958165908.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/30772518719.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109071759428956.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/66505798866.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=redmi+note+7+pro+miui+11PDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/77527686173.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD316 24004 bytes
SHA-256: 621ea0bf6d48b232dd683d5194783c6a34e2d965c4070cdccd77ee08bc9cc132
font_01_sfnt_off00010f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F88 10424 bytes
SHA-256: 4ba7b24e62dcb30c04af7119bdc088e3ccec6767fdf58bb482f36294f4717535
font_02_sfnt_off0001272a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272A 16336 bytes
SHA-256: 2d20cd7f514976bcbef200b0d696692cd92d4b381d29f088956670fe34cf368d
font_03_sfnt_off00013d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00015589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15589 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c