Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6e6e1264576354c…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 03:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e7836fb8aaee78b79e1e902fbb122de2 SHA-1: d42ef963182189982189bae155d836f5838ddcc7 SHA-256: b6e6e1264576354c9ee27a76d772cc14f97635c8a262bbe9357687d399e4cc37
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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=how+to+set+background+in+messenger+video+call PDF link annotation
    • http://cerescommoditiesltd.com/Images_upload/files/46019236259.pdfIn PDF document text
    • http://bscartridge.com/pic/xasuvoniruduzeroweso.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/bivugufa.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/61704286902.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/nugidelapadirife.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402c9b49929---79440803045.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/jevowupilokumitot.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/76261096557.pdfIn PDF document text
    • http://kunbot.com/upload/files/41943522608.pdfIn PDF document text
    • http://hangquangauto.com/files/92103279737.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/h4sd8jq3sh6mrk2o19rcvhoajk/81109469740.pdfIn PDF document text
    • http://om-ar.com/userfiles/file/mowesivaxipapufujefutuwem.pdfIn PDF document text
    • http://mylodge-naoshima.com/31327091842.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/radafudetovevazumox.pdfIn PDF document text
    • http://szm.hu/userfiles/file/6568154988.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210905_DF45A0F562094C9A.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/42108215201.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/gakipupuvefuweweje.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/zadosokojola.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/papukosubukajor.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/73770668983.pdfIn PDF document text
    • http://slr-eyewear.com/slr/userfiles/20210906232211.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/27368613350.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/detikamabisilopowufurarab.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_off0000da57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA57 18376 bytes
SHA-256: 9bf2f5774dfa4649a7938e7515c6d5f86b462bb77618af9ff2695a09bffcbbe2
font_01_sfnt_off000109d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D8 11188 bytes
SHA-256: c85757bd15db2937a450df4f38a543a08fe5904d58a9eb710f28d0ddedf0937d
font_02_sfnt_off000123dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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