Malicious PDF — malware analysis report

Static analysis result for SHA-256 173df55c9ecccff0…

MALICIOUS

PDF

69.7 KB Created: 2021-02-09 23:04:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 223b97d4bd6850eeb8dbd5bdc18aedc7 SHA-1: 4cfb933842179e188e3b314f294bd6590521b321 SHA-256: 173df55c9ecccff0ab68ae2e796f342ce58554c3662f35aef96e92549714f9aa
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/wb?keyword=algorithmic%20problem%20solving%20backhouse%20pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369519/normal_601a63f911571.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366044/normal_6020a7a0b2b00.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxarulenogu/c8htysG/easy_chocolate_cake_recipe_no_eggs_no_butter.pdfIn PDF document text
    • https://cdn.sqhk.co/takularozo/B3djaRL/gun_shot_sound_mp3_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zamokaxu/eS3b6hi/vazebinujimufap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448330/normal_5fd62ad11b935.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476416/normal_6007118283a3a.pdfIn PDF document text
    • https://cdn.sqhk.co/wefegiwezon/klgggh3/daddy_long_legs_with_wings_uk.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/jevopemosod/navedovexulebunakad.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/stoichiometry_limiting_reagent_problems_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/create_sql_server_table_from_excel_spreadsheet.pdfIn PDF document text
    • https://s3.amazonaws.com/futamo/bollyshare_june_2018_bollywood_movies.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/95916139810.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/google_chrome_apk_android_4._0.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/semovovonokazadudimig.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_off0000d36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36B 5824 bytes
SHA-256: bb475b8f2a7d534d9adb7708c9a1682a52bc3259d50d0f811dfbd0bbbdaf188b
font_01_sfnt_off0000e71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71A 10232 bytes
SHA-256: 441329ae360a7847509fc6d8506284a4344186521b5c5d395e03bb27d9b6bb2b