Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a7f2e37739b4a55…

MALICIOUS

PDF

75.6 KB Created: 2021-04-05 23:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b11445ec3862825846dd1f7ed949cd6a SHA-1: e1ff0f811c74b8637cdc20a0145ee65bbbbbdb58 SHA-256: 7a7f2e37739b4a55cf0ab05ce85efc916dc3562dab3ff1bf91fbe881f4d79699
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. The high-severity heuristic PDF_SEO_UTM_REDIRECTOR_LINK points to a lure for free downloads, directing users to the URL https://xezojetit.ru/123?utm_term=demonstrative+worksheet+for+beginners. While no scripts were explicitly extracted, the PDF structure and the nature of the URL suggest it is designed to redirect users to a malicious site for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/123?utm_term=demonstrative+worksheet+for+beginners PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426545/normal_600a7a0768fc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411479/normal_602f6a2a90ca8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473052/normal_601faede79c57.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/hhhjgeK/gupovo.pdfIn PDF document text
    • https://cdn.sqhk.co/madufuxenuw/b0PBDrA/sasenavatobexafapiko.pdfIn PDF document text
    • http://silatapejix.iblogger.org/ceh_certified_ethical_hacker_practice_exams_fourth_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/fowipovoji/9yPzGjj/ashta_chamma_video_songs_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379363/normal_60132fd4bcb69.pdfIn PDF document text
    • http://mixojixirofaj.iblogger.org/connotative_denotative_worksheet_middle_school.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/JLhbXgd/58248202663.pdfIn PDF document text
    • https://cdn.sqhk.co/motulobugaji/eHG7vjf/bowling_near_me_open_during_coronavirus.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/RjhWPif/block_puzzle_star_finder_online.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/baxegezivumi/best_airpods_android_app.pdfIn PDF document text
    • http://fewetero.epizy.com/sigatuxewizarajawedebib.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/54698086640.pdfIn PDF document text
    • http://miduzusajaveg.rf.gd/shake_yo_body_song.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/87511815755.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/15668658860.pdfIn PDF document text
    • http://wiribuxumuw.rf.gd/dexusixebabegituxusadipad.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/23661351232.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/adverse_event_reporting_fda.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_off0000e950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE950 5504 bytes
SHA-256: 1c29e4a83732c05f3c5cc04059f70373e9139de0f8a09697e3d67f47bc6a01c3
font_01_sfnt_off0000fbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFE 11088 bytes
SHA-256: 5c3bb76361320f8984d080c6b863960d49702c99057fdcc24ddf0393d291097d

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