Malicious PDF — malware analysis report

Static analysis result for SHA-256 1321a3b2b7c7fc02…

MALICIOUS

PDF

78.4 KB Created: 2021-03-22 10:13:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0ce372732f1d79fa0f75d3e09e2dad9f SHA-1: dc0461bb4c4a12acfd8698e979bc8232f13bcdf4 SHA-256: 1321a3b2b7c7fc02c9d298ceb51238242ecc9468be9db047e19b3012b8579623
144 Risk Score

Malware Insights

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

The PDF contains a high-severity heuristic indicating it is a phishing lure, using an image to redirect users to a malicious URL. ClamAV also detected it as Pdf.Phishing.Trojan. The embedded URL and the document body suggest a deceptive attempt to entice users with 'free download' content, which is a common phishing tactic. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jumiwimov.ru/award?keyword=upsc+mains+answer+sheet+pdf+for+practice PDF link annotation
    • http://vaxenovutejuzid.sportsontheweb.net/what_does_error_code_ae_mean_lg_dishwasher.pdfIn PDF document text
    • http://ruxuzosok.mywebcommunity.org/zofamodar.pdfIn PDF document text
    • http://paxenazubenib.mygamesonline.org/explain_the_three_estates_of_france_class_9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417426/normal_604db75811d0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488804/normal_603578d280354.pdfIn PDF document text
    • http://fadulifakibul.medianewsonline.com/ducane_air_conditioner_cover.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368496/normal_6015b42f7e21e.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/tobito/newspaper_background_powerpoint_template.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/business_card_template_photoshop_cs6.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/idiom_worksheets_for_4th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/54328764833.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/do_beats_studio_3_come_with_a_warranty.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/48109117374.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/47370629746.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/wiwopufilevaxogoweteviwod.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/guidestar_india_registration.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/bruno_munari.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/rerafokebuw.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/wajuzipimebor.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/cg_song_new.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/beretta_92fs_compact_iwb_holster.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_off0000f413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF413 5448 bytes
SHA-256: 927ea2bb566672df76bc82af9cb20477c07a5b616455b85c6056ee4f663c6daa
font_01_sfnt_off00010683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10683 11136 bytes
SHA-256: 1ebb455f799dfad65184488015e047e47b4d0370edc51e8c563579fa2bd3566b