Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf40341f2e11e75c…

MALICIOUS

PDF

79.7 KB Created: 2021-03-18 07:07:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3fbbe769c3bfcab7ceddc4659b34041d SHA-1: aab013e594bd5cac6a3ac2474650655f61a1f25f SHA-256: bf40341f2e11e75cb11775efa344f6489b5680993e10d9d72891c4e5ef1da494
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with critical heuristics indicating a PDF link farm. The document contains numerous external links, with one pointing to `https://midufefew.ru/wix?keyword=loot+not+changing+load+order+mo2`. While no scripts were explicitly extracted, the PDF structure and the presence of many external links suggest an attempt to redirect users to malicious content or phishing sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/wix?keyword=loot+not+changing+load+order+mo2 PDF link annotation
    • http://lajulufubugo.22web.org/8857578979.pdfIn PDF document text
    • http://tefotofunuwugan.iblogger.org/60651462723.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377401/normal_5ff0079b0205b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486193/normal_6041fc2f2cf45.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413368/normal_5fc7328fdc777.pdfIn PDF document text
    • http://dojixosop.iblogger.org/xiweb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449789/normal_60295f2a6b02d.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/jeduzizonox/inverse_functions_examples_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/37501824305.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/how_to_connect_bluetooth_to_sony_wx-gt90bt.pdfIn PDF document text
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_5d2a146547f84a8fb0ff430ba29bc85d.pdf?index=trueIn PDF document text
    • http://josejutolaxof.rf.gd/86665340046.pdfIn PDF document text
    • https://s3.amazonaws.com/zowibatev/polaroid_template_psd_a4.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/66521714345.pdfIn PDF document text
    • http://luwulifinuneti.epizy.com/smoke_brush_photoshop_cs5_free.pdfIn PDF document text
    • http://maguvotu.rf.gd/ruduzetedewad.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/vudugi.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/deferred_payment_meaning_credit_report.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/fubiwalosonu.pdfIn PDF document text
    • https://246406bc-bb0d-4f29-baed-d8a6153a9543.filesusr.com/ugd/3ddeef_58f71e1b63a44e2dba921377db51343f.pdf?index=trueIn PDF document text
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_3b977ac290c047aa9783661f42a42934.pdf?index=trueIn 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_off0000f954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF954 5248 bytes
SHA-256: a45506344d82d41c2add453d3f0f3cb4005a8d49d36c25224b867cc83858c14b
font_01_sfnt_off00010b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B03 10708 bytes
SHA-256: 8ac3649641ab843dab3fa645e3192c24a5186531c5b8f956ca390f9161e4c535

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