Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f92cc9becb3f244…

MALICIOUS

PDF

75.6 KB Created: 2021-03-29 12:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 093824bb7b24b06d81890f1eb0756d3e SHA-1: c8e923d5bb6d29b70c331dda74dcf393c1112723 SHA-256: 7f92cc9becb3f24408d3c06123b392d314cf4bc866263af01dcd8bb7e0f489c1
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as phishing. It contains an external URI and an SEO redirector link pointing to 'https://midufefew.ru/award?keyword=compound+adjectives+exercises+pdf+with+answers', which is indicative of a phishing lure disguised as a free download. No scripts were extracted, but the PDF structure and heuristics strongly suggest a phishing attack.

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://midufefew.ru/award?keyword=compound+adjectives+exercises+pdf+with+answers PDF link annotation
    • https://cdn.sqhk.co/kakapoxavu/QZChfpz/23184058756.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/bghjeqs/driftwood_beach_california_address.pdfIn PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/cQkJAjb/wolf_games_online_free_no_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwadezab/WicjdZG/pirates_of_the_caribbean_coin_song.pdfIn PDF document text
    • https://cdn.sqhk.co/zijikunu/sOGNjgg/battleship_legion_war_of_pacific_rim.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/9R0jcjf/82637110124.pdfIn PDF document text
    • https://cdn.sqhk.co/norifasil/iYihuRr/49083605534.pdfIn PDF document text
    • https://cdn.sqhk.co/suxepemup/WFibBji/ruby_emulator_and_tips.pdfIn PDF document text
    • http://ditoterelutas.sportsontheweb.net/55972154370.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/jusagi/vivitar_mini_digital_camera_driver_windows_10.pdfIn PDF document text
    • http://sajulugebimisu.myartsonline.com/16263634735.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/kaminey_the_scoundrels_movie_filmywap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b3eaa60-5df3-4022-a597-09533826b537/kutagazoxanomuju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57fdc785-32c7-49e2-a649-c534141d2d37/84269317060.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/lavuvodonafo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/502dfbcb-0b63-4b95-b9ae-a0ca109cc80e/how_to_connect_trimble_tsc2_to_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/14809849929.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b79e049b-9304-4738-a3d4-4d73618914ca/9884692341.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0937da66-344c-48ff-a78f-41f48ecf1971/55238862076.pdfIn PDF document text
    • http://supajiwa.myartsonline.com/69047061930.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_off0000e6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CD 5564 bytes
SHA-256: 75314f67aaa100a9de77391343367fd89917065020ab5b02a913f472304aa861
font_01_sfnt_off0000f9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A7 11008 bytes
SHA-256: da42f21180fbec885acb8a87446edc5f91fc934274598feaf4849ef43d70980b

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