Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a59b53fa18958ea…

MALICIOUS

PDF

81.6 KB Created: 2021-05-04 04:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: dd0e3b2763693e6e7db2f8656ee27ef1 SHA-1: a9e7b125d9da5610c49de1a6115747867cab19f0 SHA-256: 2a59b53fa18958ea71d0a721145fdbc8a4461c82bcbf498f5ec560cccdf1f99d
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://crophysi.ru/strik?utm_term=crucial+conflict+call+of+the+wild'. This URL is likely used to lure victims into a phishing or malware download site. The ML classifier also strongly indicated maliciousness, and ClamAV detected it as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf, suggesting it was programmatically generated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/strik?utm_term=crucial+conflict+call+of+the+wild In PDF document text
    • https://cdn.sqhk.co/dasadogiso/Hgcijie/49558090404.pdfIn PDF document text
    • http://lupazul.mywebcommunity.org/bioclimatic_architecture.pdfIn PDF document text
    • https://cdn.sqhk.co/xiwasazafu/jbgjMqs/57803786734.pdfIn PDF document text
    • http://rijunoje.mygamesonline.org/believe_in_yourself_joseph_murphy.pdfIn PDF document text
    • http://rabiwitijif.medianewsonline.com/anatomy_of_maxillary_sinus.pdfIn PDF document text
    • https://cdn.sqhk.co/pivokazi/hghghhf/tezukiregixelafi.pdfIn PDF document text
    • https://cdn.sqhk.co/resesexiraf/t9jgjcM/zetofejurudulidi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474736/normal_6000ae4cafe90.pdfIn PDF document text
    • https://cdn.sqhk.co/fajaleniwa/5hajigc/download_indonesian_drag_bike_street_racing_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411245/normal_6005084c3d4ae.pdfIn PDF document text
    • https://cdn.sqhk.co/vapumojemov/jhhcuHy/zifosarorudegimidafi.pdfIn PDF document text
    • https://cdn.sqhk.co/narulaloro/hjOhgjh/windows_10_lock_screen_settings_greyed_out.pdfIn PDF document text
    • http://wixujikubipom.mygamesonline.org/wifudegigimexejew.pdfIn PDF document text
    • https://cdn.sqhk.co/polidupokasu/fgihiFt/kanto_starters_pokemon_sword.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae73414a-dd4b-4f2f-8a7a-6a58f67a73e8/xudafumisuvifajojijolot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de7716bf-f4b9-4c58-ad6f-1d49af4f1bb8/the_sign_of_four_summary_in_marathi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5df848d0-f0aa-4932-b98e-04b9c6867489/pretty_little_liars_season_4_episode_13_full_episode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cf86c36-09be-4e63-b2d8-78215f214f8a/are_body_fat_scales_accurate_bodybuilding.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d023406-301d-4ce2-8c79-ea95889f290e/why_text_is_important.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_off00010242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10242 4928 bytes
SHA-256: f0a1a01249053b374a49d67a67583b941e9d1a9f07b72dd23224af31c01cc67f
font_01_sfnt_off00011310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11310 11112 bytes
SHA-256: cc5219f11f876b94278ccf38cb459a8df05a1b17e6c212994cf25478d225c48a

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