Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dbbca41b688b79b…

MALICIOUS

PDF

78.8 KB Created: 2021-03-29 05:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: dda0d16eee5b46e9e6543ffd1c9e7245 SHA-1: 8846807c9cc7a0c60e70c50f679861224e0234a7 SHA-256: 2dbbca41b688b79bf1e12aacf4a160ed4dc8f66a58ea6c680fbe89bc93311135
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The document body is heavily obfuscated, but the presence of embedded URLs and the heuristic findings strongly suggest a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://kuzutuzo.ru/123?utm_term=ude+ude+bajrangbali+video+song PDF link annotation
    • http://fojefojegut.medianewsonline.com/66959035450.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/hSihNjc/pc_builder_sim_free.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/gfgWAhe/talking_point_chicken_nuggets.pdfIn PDF document text
    • http://roxosavizas.22web.org/how_to_learn_english_grammar_online_free.pdfIn PDF document text
    • https://cdn.sqhk.co/terexugureto/Wiizjbt/moldes_reposteria_easy.pdfIn PDF document text
    • https://cdn.sqhk.co/fegukajebaj/ikgcBG2/rise_up_game_balloon_online_free.pdfIn PDF document text
    • https://cdn.sqhk.co/noxisoture/hbhidjd/zerisejij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://manovotiduzabes.rf.gd/what_are_the_big_data_applications.pdfIn PDF document text
    • https://eac5c218-d238-408c-98a6-8ff0ecbb25fc.filesusr.com/ugd/b1277d_110da111090840a781c16b4f208de01b.pdf?index=trueIn PDF document text
    • https://22e44a25-5b44-49ab-8bd1-9de78d2943b2.filesusr.com/ugd/cce535_57a4f7aba9e34f4b815675e06b2d940d.pdf?index=trueIn PDF document text
    • https://1058d175-53f8-4d86-9201-ae9c1fc74009.filesusr.com/ugd/62a633_31b827af169744daa2e87ae2082e9248.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9100d0f-7297-4856-8c60-c784a3f09fe8/57817893400.pdfIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_1f40e65207ba4c78bc871e030cc7f5f1.pdf?index=trueIn PDF document text
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_a81b6b882b1c4f6789a88484057d4aa0.pdf?index=trueIn PDF document text
    • https://3e1d1bad-f645-4ebd-ac75-469e7ff7c972.filesusr.com/ugd/e745be_c3454a43101e4bf5b4062002a5d1c7ca.pdf?index=trueIn PDF document text
    • http://xugivazule.rf.gd/7206796451.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2054a45f-e4f3-4ab0-a0b5-31a5b4f37366/hitchhikers_guide_to_the_galaxy_quotes_dolphins.pdfIn PDF document text
    • https://68e1e3d4-268d-49bc-a8aa-b119cb10fea7.filesusr.com/ugd/3ceeb9_e82c1e33f3394fe88e4e7b6e4efae7a9.pdf?index=trueIn PDF document text
    • http://tanonarimunal.myartsonline.com/define_payoff_in_statistics.pdfIn PDF document text
    • https://a7563df4-ba19-4d82-a8a0-b2470d957038.filesusr.com/ugd/61f964_ea41539084884b14b99f152a7939a0df.pdf?index=trueIn PDF document text
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_26d6a9f8fdf44ad99552d48aa0064f8e.pdf?index=trueIn PDF document text
    • http://kojuvurapamox.myartsonline.com/interview_questions_and_answers_for_hr_round.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a843e84-ed46-4dae-b6ac-d4918e52cc1e/xonadaxilunonozogawegixi.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_off0000f416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF416 5260 bytes
SHA-256: 9a26caccb222ff09f6002a46435b7206543da34eeef56ffbb3e61c6c4803e2a5
font_01_sfnt_off00010613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10613 11764 bytes
SHA-256: 411a5e97a088c0b7f4f6f796d63b07f06440df0ba13bda92068f8d6091fa15f1

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