Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0c273157fc7fb66…

MALICIOUS

PDF

79.6 KB Created: 2021-03-23 21:06:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a111bc3b7431f6e1f1c855a840198b97 SHA-1: 71b731d286bcd2e83c1728a4d6758c7b2ac9b12b SHA-256: f0c273157fc7fb66d2f5c41b08328ad350ccb97ecd0040a3e25110abde3c74c3
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a heuristic firing indicating it is a phishing lure using an SEO redirector for free downloads. The embedded URL, https://jacksth.ru/aws?utm_term=what+is+sat+essay+subscore, is identified as the primary malicious indicator. Although no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely involving a redirect to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jacksth.ru/aws?utm_term=what+is+sat+essay+subscore PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4365606/normal_5fee69ad19b98.pdfIn PDF document text
    • https://cdn.sqhk.co/juvekuvop/Q511hhr/dynasty_season_6_episode_guide.pdfIn PDF document text
    • http://dopadogexegox.22web.org/writing_advice_for_beginners.pdfIn PDF document text
    • https://cdn.sqhk.co/wosepimi/tL1FYjg/11204657651.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374372/normal_60233c70af4cf.pdfIn PDF document text
    • http://gesenimul.22web.org/35902457667.pdfIn PDF document text
    • https://cdn.sqhk.co/nemisova/Ozhjgc0/android_tv_box_himedia_a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476127/normal_5fd742e62beec.pdfIn PDF document text
    • https://cdn.sqhk.co/fupokiwil/hjiexgh/tcc_administrao_de_empresas.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/mejobu/amazon_alexa_app_for_ios.pdfIn PDF document text
    • https://07e0a16e-b77d-475b-b724-88bbaedb347c.filesusr.com/ugd/8e9e2f_20ea22e3bfbd405bb9afd7e1dd4a04be.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/96301899038.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/74756083749.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/limiting_reactant_and_percent_yield_lab_report.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/wuzokorasutugeden.pdfIn PDF document text
    • http://lafonariki.rf.gd/91052731200.pdfIn PDF document text
    • http://dunetelezosamat.epizy.com/radio_shack_big_button_remote_control_15-310_code_list.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/domain_and_range_worksheet_kuta.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/basic_yoga_postures.pdfIn PDF document text
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_3c1da891933a4258b149fc41d9902945.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_off0000f965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF965 5108 bytes
SHA-256: 0408e04a18080e2cdfd5863ad8c2d37178fffa6a8b3297a4b3479a4eef28d482
font_01_sfnt_off00010ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD2 11128 bytes
SHA-256: 01a3db2b2e1bfae6b17ccc11d532884cea84b4dca8d587559810ecbbfe03998d

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