Malicious PDF — malware analysis report

Static analysis result for SHA-256 4120d7fb438a838a…

MALICIOUS

PDF

81.9 KB Created: 2021-03-18 00:02:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93631f0fd1b8df4e5d9544596606d14e SHA-1: 1820dca035a599a3b5ea099d1c16f51a7c14d53f SHA-256: 4120d7fb438a838ad07d26e2c3b9defe34776355bfc9e4bd38c4fd36915dc566
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The document body, though malformed, references 'causes of the great depression apush worksheet', a common lure for educational-themed phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://jumiwimov.ru/123?utm_term=causes+of+the+great+depression+apush+worksheet
    • http://tapozifokun.mywebcommunity.org/mokim.pdf
    • http://jedilinosur.mywebcommunity.org/5th_grade_math_multiple_choice_questions.pdf
    • http://tebafurunaxinuj.getenjoyment.net/apartheid_pass_laws.pdf
    • https://cdn.sqhk.co/businaxidare/rgcjgia/new_headway_beginner_tests.pdf
    • http://nexefugo.iblogger.org/motu_patlu_cartoon_hd_song_video.pdf
    • https://cdn.sqhk.co/pesuxitum/2kYSOaj/46236521786.pdf
    • http://vivekawiga.sportsontheweb.net/livro_como_trabalhar_para_um_idiota.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kesibesezusede.rf.gd/what_are_normal_forms_of_cfg.pdf
    • https://uploads.strikinglycdn.com/files/8bba8f31-a448-43cc-b9fc-2b3b407b6cb9/65523006046.pdf
    • https://s3.amazonaws.com/wupagivoz/rojitatoziwajoriwiz.pdf
    • https://uploads.strikinglycdn.com/files/4a71656f-288f-4649-ae50-02ec20676626/can_you_have_a_negative_scale_factor.pdf
    • http://pigozezidum.rf.gd/using_information_technology_a_practical_introduction_to_computers_and_communications.pdf
    • http://tunogamux.rf.gd/how_to_set_a_clock_with_hands.pdf
    • http://zewixezix.epizy.com/mah_mca_cet_2019_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/790711a9-d36d-41ef-b037-a4955775abd3/pisalaferuj.pdf
    • https://s3.amazonaws.com/bokofapig/jewabowovunini.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2cd.bin
dd5fca8fa8919d7b0b0df58e4896be0177e5c99c142b1f3724422d49b2671e96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CD 5332 bytes
font_01_sfnt_off0000f4f4.bin
d0f49cc195c1bf31025e9f0e2a1c0016543c567966f58b7536460b272fcd7c9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F4 1716 bytes
font_02_sfnt_off0000fd7f.bin
0e7074e924974e5eb1ddeddfe3500b39dc11a4d35f1549ff3021f64d573b2a10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7F 11076 bytes
font_03_sfnt_off000123b0.bin
15a858e7ca58810eedca6b314cbf9fe35668ea3040246c24a6c9bd629062bc34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123B0 16480 bytes

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