Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd2ae789e23384f…

MALICIOUS

PDF

70.8 KB Created: 2021-09-28 04:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d83ba65138a2b7f15a2d12062921aecc SHA-1: 99c4732889bc8094c5807111c03f885ec347391b SHA-256: 8bd2ae789e23384fbb589452e438a2155f0e56ffd7259654e04159b631109bd5
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Numerous external URLs are embedded, suggesting an attempt to redirect users to potentially harmful sites. The 'wkhtmltopdf' authoring application and the nature of the embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://f2h63c2.ip4secure.net/upload/files/zalinixewiveravokevu.pdf In PDF document text
    • http://heimundsicherheit.de/userfiles/file/46733933184.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/28062377395.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/12797510555.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/33766919272.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/telupuvuj.pdfIn PDF document text
    • https://servicepapik.ro/files/varebowefavutoxuxo.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/42442637482.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/41121220699.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210910155010.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/19797499414.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161457d6ca1381---21563258370.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/wibomixuvod.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/26495450528.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/14060256922.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/8e1290803ea11a144ac19eac71f62f74/rumufipe.pdfIn PDF document text
    • http://angkaganjil.com/contents/files/73385592011.pdfIn PDF document text
    • http://adwokaci-pila.pl/userfiles/file/lojaduwepuseniwapolalag.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/24489396543.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/loterekudilevigizatow.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/jedadewo.pdfIn PDF document text
    • http://ilovestory.com/upload/file/11298784760.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/95162363541.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/40419486605.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/37725023055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=offline+2020+android+gamesPDF 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_off0000b277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB277 10864 bytes
SHA-256: 23397efb95e6126014a3a358a6c3f77da0e97b3f44b432480ecb430dfad0f1a5
font_01_sfnt_off0000cb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35F 16724 bytes
SHA-256: 848995db0e8ab92b0c72bfd1faad601bbbba40f9246b96ae12ee57c3e3c6d3f6

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