Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66995b1eb425f5d…

MALICIOUS

PDF

356.7 KB Created: 2021-04-23 08:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c129c7118842f920d6cc1ccd88bf5e1f SHA-1: 7a776e7608eaf6d53ca8887fd844fce78776d1c6 SHA-256: b66995b1eb425f5d4ae01a4815e9c7f2d5093977150ea4c41d4a127fcd3faa11
144 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing lure, specifically using an SEO redirector to disguise a download link. The ML classifier also flagged it as malicious. The embedded URL points to a suspicious domain, suggesting the document is designed to trick users into downloading a secondary payload, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9376

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://mezovuduw.ru/strik?utm_term=aashto+roadside+design+guide+2018 PDF link annotation
    • http://xuroriwonufuz.scienceontheweb.net/myers_ap_psychology_test_bank.pdfIn PDF document text
    • http://zonagareme.getenjoyment.net/aocs_method_cd_3_25.pdfIn PDF document text
    • http://pojapusevipuzu.mypressonline.com/psicologia_aplicada__administrao_de_empresas.pdfIn PDF document text
    • https://pawimugonuri.weebly.com/uploads/1/3/4/8/134882006/lularokajafun_pitimexi_lulibo_vugekirodefo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417997/normal_60290a9b81cd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367922/normal_5fe8b276762a0.pdfIn PDF document text
    • https://jonokiruvonanum.weebly.com/uploads/1/3/5/3/135319333/1582a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380384/normal_6044e5a610a76.pdfIn PDF document text
    • http://wigageturuv.mywebcommunity.org/togimufinulopagutafulijo.pdfIn PDF document text
    • http://rusakadovub.sportsontheweb.net/how_to_program_genie_gm3t_remote.pdfIn PDF document text
    • http://dewodalaluw.mygamesonline.org/povurizalunipuzo.pdfIn PDF document text
    • https://rekozoweno.weebly.com/uploads/1/3/4/3/134364890/jokulunefeduzi.pdfIn PDF document text
    • https://jorosovepi.weebly.com/uploads/1/3/4/7/134706332/bubivemizu_rirebedodup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454677/normal_605b7464cd605.pdfIn PDF document text
    • https://xasedomag.weebly.com/uploads/1/3/1/0/131071243/6042037.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371013/normal_6037ce8e0bbea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wofavum.myartsonline.com/47542532067.pdfIn PDF document text
    • https://cee4c475-053c-4dec-97e8-987d41263e46.filesusr.com/ugd/8c25c6_0d117d436c0b4dd2a1ab2806114b61a6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pukaridimupo/which_of_the_following_is_a_childs_zone_of_proximal_development.pdfIn PDF document text
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_87cf261c4b33463eaf201f2fb4975d96.pdf?index=trueIn PDF document text
    • http://jumawivowibeb.onlinewebshop.net/bengali_alphabet_writing_practice_book.pdfIn PDF document text
    • https://edcb5511-827b-40b0-97c1-3499c313f96b.filesusr.com/ugd/0779a3_40df7ee3882e4d469a8acd486465ca07.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/cocos2d-_js_sprite_sheet_animation.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/wagaze.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/classic_wow_warlock_leveling_guide_icy_veins.pdfIn PDF document text
    • https://adc67df4-9ac4-4169-8225-f8d60376216a.filesusr.com/ugd/a1c2c7_71726afb7dd84592b076dc4375fc4d41.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_off0005432e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5432E 5564 bytes
SHA-256: 1367192370f225d27af231735f051c71d6ec1577eb12ead8f628062c09b84382
font_01_sfnt_off00055617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55617 13672 bytes
SHA-256: 42a91552ac59880f29c813e3525e840b5066e2be2b81027dbec58837ba264c58

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