Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dbdac112576f5d3…

MALICIOUS

PDF

88.4 KB Created: 2021-04-07 21:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b74d5bd3d39416c612b81da1eb03b39b SHA-1: 73d2bde2f623a8e068f9264672852755a944607c SHA-256: 9dbdac112576f5d3e28f109cce298c5a001243d851a8304c47b90e5ad089e910
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to direct users to potentially malicious or phishing websites. The ClamAV detection and ML classifier also indicate malicious intent. The primary IOC is the external URL used in the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • 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=sig+sauer+p229+9mm+elite+classic+carry+talo+review PDF link annotation
    • http://nuloriwilorij.scienceontheweb.net/repeletatemej.pdfIn PDF document text
    • http://jemulobapamiwu.mywebcommunity.org/new_testament_church_of_milwaukee_website.pdfIn PDF document text
    • http://creditreportusa.info/jabolidebijodapem6adbi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388276/normal_6000a0fd6bc1f.pdfIn PDF document text
    • http://hhizmet.com/kukifotakowuvamuge3tt7p.pdfIn PDF document text
    • http://moitender.org/should_i_buy_a_branson_tractor0wpu7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416494/normal_5fd143fdd0a98.pdfIn PDF document text
    • http://jolovomolosubi.getenjoyment.net/vupigapokalu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502819/normal_5fe4e6eb98c96.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453537/normal_5fdedda42196b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409093/normal_601fd72244c54.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/how_do_you_know_if_a_guy_is_interested_after_the_first_date.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/xalalotobuw.pdfIn PDF document text
    • http://seretavezoduriz.onlinewebshop.net/wutilurewelidibuwab.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/school_day_apk_mod_free.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/armed_heist_android_release_date.pdfIn PDF document text
    • https://7b4e975e-109f-4397-a679-93e438ff1453.filesusr.com/ugd/c33f71_1bf794f6396248baababa12cdd9d1554.pdf?index=trueIn PDF document text
    • https://2863666b-9d79-467d-9aad-9eeb6dafbdf2.filesusr.com/ugd/6ee3eb_7bc7baeb0650400b8daf1df1630e758c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/gimp_tutorial_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/giguwegumajefapopero.pdfIn PDF document text
    • https://s3.amazonaws.com/gagotaniwipure/infinix_note_8i_current_price_in_nigeria.pdfIn PDF document text
    • https://56076a71-1b70-41e8-afe1-d547c394b4ee.filesusr.com/ugd/ab0d05_59840cf1223849b687709c3ae5469e2c.pdf?index=trueIn PDF document text
    • https://aece7fbc-7072-4055-9cfa-29e0da41b620.filesusr.com/ugd/e878fd_fa86acb9267e4ee992bc993dbcb31c13.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lososimap/tukalobobatemawejaromez.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11736 5896 bytes
SHA-256: 55a905130c31d03582f9494e6619319870f74930725104e3ba88e6461cce1136
font_01_sfnt_off00012b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4A 11944 bytes
SHA-256: cc0cbee0f93e253941c3f0f1f76ba43c55d6944ae7c5acbb43a79022cb32069e

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