Malicious PDF — malware analysis report

Static analysis result for SHA-256 afb0d4158c01e812…

MALICIOUS

PDF

80.5 KB Created: 2021-09-14 13:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 15cc173def1852d9fd8c7579c738f47d SHA-1: 622fff1a26b261902cd2d7b7ae4033a7e6b5d233 SHA-256: afb0d4158c01e812b870711466cc349ac6360684957e0dbf3fa9756a9769e715
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The PDF's structure and the presence of multiple external links indicate it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://crewmak.ru/uplcv?utm_term=internal+voice+recorder+for+android PDF link annotation
    • http://tg-focus.ru/userfiles/files/78776648533.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea3c2c456e---97094766060.pdfIn PDF document text
    • https://maria-galland.ru/files/file/84862696508.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/61988201315.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/nivefupiweto.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/luzinopuxesibomifu.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613115a89582c---kepir.pdfIn PDF document text
    • https://mraos.com/web/userfiles/file/34553355761.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/63196470172.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/diliki.pdfIn PDF document text
    • http://consade.com/userfiles/file/wedexilepuso.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/xisadejos.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/23078844028.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/budafurojivazude.pdfIn PDF document text
    • http://movediary.com/userfiles/file/61622888249.pdfIn PDF document text
    • http://apcmagon.com/userfiles/zufigetisezaxubopesegiwad.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/fewurisezuzalibomodulit.pdfIn PDF document text
    • http://emannsltd.com/userfiles/11330524477.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/rowunabidubinularo.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/ganewugomituteturun.pdfIn PDF document text
    • https://tpk-m.ru/files/file/duvokerod.pdfIn PDF document text
    • https://sanagustin.cl/files/tekokadugulexuwonid.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/71140549665.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_off0000d750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD750 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF67 10316 bytes
SHA-256: 9d9e9de5a13287ed7aa972314f4565df6aeb3eccb12101ba782971f62344bded
font_02_sfnt_off000106c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C1 17604 bytes
SHA-256: 0da018b16fe9e7470154aae242c81ec84d2c21e1b556c6acd9b94e04c03495c1

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