Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bd3fb8333ea81b8…

MALICIOUS

PDF

83.0 KB Created: 2021-05-21 23:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84c7c8558d811615c20a65fbed8ae4cb SHA-1: 7e93e825c303f4939bd99ad44edb8d38314180f1 SHA-256: 5bd3fb8333ea81b85a911e21ff13e977375c0af906f356418375cbbdbb2b4efb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, with one prominent link pointing to `https://xezojetit.ru/strik?utm_term=how+to+enable+vulkan+r6`, suggesting a lure to download a payload. The heuristic `PDF_SEO_LINK_FARM` indicates a large number of embedded links, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://xezojetit.ru/strik?utm_term=how+to+enable+vulkan+r6
    • https://foxakiletomuxo.weebly.com/uploads/1/3/4/0/134012751/bepakobapigovipe.pdf
    • https://ropexosuwewi.weebly.com/uploads/1/3/1/3/131380205/nowosijagawezu.pdf
    • https://cdn-cms.f-static.net/uploads/4377101/normal_606cb0397c1b1.pdf
    • https://kixixowagixu.weebly.com/uploads/1/3/2/7/132710794/junul.pdf
    • https://cdn-cms.f-static.net/uploads/4381098/normal_60637e9251d32.pdf
    • https://jovegubegatok.weebly.com/uploads/1/3/5/3/135318826/9488632.pdf
    • https://cdn-cms.f-static.net/uploads/4470024/normal_602cd6805bb9b.pdf
    • https://vitiwujujoter.weebly.com/uploads/1/3/4/6/134659282/3113247.pdf
    • https://rigukolanerimi.weebly.com/uploads/1/3/4/5/134519373/58f3f76e5.pdf
    • https://viwosexoteb.weebly.com/uploads/1/3/4/6/134631328/leronuw-miruwijexek-suxivabopulegul-pukogukuf.pdf
    • https://cdn-cms.f-static.net/uploads/4466661/normal_5fd9000d595db.pdf
    • https://cdn-cms.f-static.net/uploads/4370560/normal_600fb7e629684.pdf
    • https://cdn-cms.f-static.net/uploads/4388063/normal_6066e2aae6551.pdf
    • https://static.s123-cdn-static.com/uploads/4470412/normal_6004a95321d5b.pdf
    • https://kejarokelevu.weebly.com/uploads/1/3/5/2/135297316/linexi_teduwizevusine.pdf
    • https://cdn-cms.f-static.net/uploads/4416790/normal_5fd7955ec6720.pdf
    • https://wikaxefukefep.weebly.com/uploads/1/3/4/5/134519338/fefuraxipisuko_wesobofosetesup_bakivenirobana_govusa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/luramamelolem/zigejepewugo.pdf
    • https://s3.amazonaws.com/bajapovogam/futenizazoka.pdf
    • https://s3.amazonaws.com/jobavo/83715380152.pdf
    • https://s3.amazonaws.com/gizonukorad/nuwepinukakukage.pdf
    • https://s3.amazonaws.com/minegikukovel/callan_method_free.pdf
    • https://s3.amazonaws.com/loranoduzuja/a_prayer_for_owen_meany_summary.pdf
    • https://s3.amazonaws.com/webipejonavuv/malaria_test_report.pdf
    • https://s3.amazonaws.com/lekizopiloref/great_lakes_training_center_navy_base_il_ord.pdf
    • https://s3.amazonaws.com/pusolefosex/mary_poppins_returns_disney_plus_release_date.pdf
    • https://s3.amazonaws.com/mudurixo/red_background_wallpaper.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010673.bin
c43008ba6613512372821a1a9c8d005c194065913a0dc634953861de2cf5977a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10673 4972 bytes
font_01_sfnt_off00011787.bin
6507a3fd271830038481df562a7129bb15bc0c772ef71c006ed608245b3c3d6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11787 11020 bytes