Malicious PDF — malware analysis report

Static analysis result for SHA-256 a65d4c97a295317d…

MALICIOUS

PDF

76.9 KB Created: 2021-03-24 14:55:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 356d053d425718b0f1f8b23007076c30 SHA-1: 5e9546894fa2665d3f0bf039cd219eb3637c2439 SHA-256: a65d4c97a295317d1485b5abbad36c31abe16a3f886f6b9a52d53319fe9dfc7c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly-hosted PDFs with numeric slugs, indicative of a link farm or SEO spam. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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
  • 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://botokaw.ru/wix?keyword=verizon+ellipsis+jetpack+manual
    • https://lupexepiw.weebly.com/uploads/1/3/4/3/134318885/4f54c09ffa.pdf
    • https://wanowozuvigamo.weebly.com/uploads/1/3/0/7/130738859/tilumezaj.pdf
    • https://gitinegu.weebly.com/uploads/1/3/4/6/134648864/6382115.pdf
    • https://cdn.sqhk.co/zivalutapa/ijaihMi/52904497913.pdf
    • https://cdn.sqhk.co/nisuxibuzoru/eXYahin/pumifebasusilazeguvo.pdf
    • https://cdn.sqhk.co/panafilaputu/CghOcia/xiwegemawuzasolatizob.pdf
    • https://cdn.sqhk.co/kokademesuz/ji9digd/daxununowa.pdf
    • https://kosofisipituje.weebly.com/uploads/1/3/5/3/135329454/9481990.pdf
    • https://cdn.sqhk.co/botonerepap/nRNigg3/77194018217.pdf
    • https://cdn.sqhk.co/vumuwuxa/jjggdjb/dj_marshmello_mask_amazon.pdf
    • https://cdn.sqhk.co/jimumakevaji/ehdihzo/getting_over_it_with_bennett_foddy_mod_pc.pdf
    • https://rekoxexegatetun.weebly.com/uploads/1/3/1/4/131452740/jupupazaduv.pdf
    • https://gitikaru.weebly.com/uploads/1/3/4/9/134901111/taniponeruz-wapusezonupoj.pdf
    • https://nibawomufexax.weebly.com/uploads/1/3/4/3/134371272/xisarizepedi_lawokatujate_maribunozig_betogon.pdf
    • https://detatabuloto.weebly.com/uploads/1/3/5/3/135346227/4035b90.pdf
    • http://posiximuteg.sportsontheweb.net/how_to_program_dish_remote_with_sony_tv.pdf
    • https://cdn.sqhk.co/pulovafafita/ggjgiNx/gojedufiwi.pdf
    • https://jevakotimafunu.weebly.com/uploads/1/3/4/8/134878594/5958011.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bigapenegig.atwebpages.com/brake_test_on_dc_shunt_motor_theory.pdf
    • https://s3.amazonaws.com/gafedupeba/master_yi_guide_op._gg.pdf
    • https://s3.amazonaws.com/fowikorejodi/journey_to_the_center_of_the_earth_1959_gertrude.pdf
    • http://situwosase.myartsonline.com/kann_man_auf_dem_kindle_dateien_lesen.pdf
    • https://s3.amazonaws.com/fotepopunaj/gopuvozit.pdf
    • https://s3.amazonaws.com/norozovijalu/lokizubebegubow.pdf
    • https://s3.amazonaws.com/ragejufa/how_much_is_a_baby_grand_piano_cost.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_off0000ef5b.bin
c99cd8e3a791a39076c7f8acbdf9764c7a3b95388dee9903c437bdbdee2250c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5B 5236 bytes
font_01_sfnt_off00010126.bin
1c4e5d84620cca670205b3fad41fbc90420e738aa14a8ee3248e90cdd8a14b99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10126 10436 bytes

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