Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f86041161c5d3fc…

MALICIOUS

PDF

100.7 KB Created: 2021-05-17 01:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: aafb595bc9d3bb07226f53379ac9085b SHA-1: e917570980b3e1fd8ee635ff8e56ebf354af2f59 SHA-256: 8f86041161c5d3fcaf6c4b70c61c4e6aaf3463e3ed45312e1b0380cf773433df
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://dafemum.ru/strik?utm_term=what+are+three+sources+of+carbon+dioxide'. This URL is presented within the document body, suggesting a phishing or social engineering attempt to trick the user into visiting a malicious site. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=what+are+three+sources+of+carbon+dioxide In PDF document text
    • http://kosamaritaj.getenjoyment.net/weight_loss_diet_menu.pdfIn PDF document text
    • http://tujijamutibe.sportsontheweb.net/55647159739.pdfIn PDF document text
    • http://vizionsmc.net/kidosimoroponeval24chq.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/newanipexesokufuginowi.pdfIn PDF document text
    • http://voiprormul.xyz/toyota_camry_se_2020zpqbx.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/7377397b-89b6-4da2-8629-645bf3d141eb/multi_code_receiver_antenna.pdfIn PDF document text
    • https://s3.amazonaws.com/luropiw/nulupedijotenison.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1401ba76-5c33-4948-abe4-b31e22f78139/sogibekozorenowibuge.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/45443982830.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/78518882323.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/611f1c6f-bdae-4c62-8db0-b77561873ec0/56429619715.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6f301d8-2c5d-4270-b8d0-1a6ea089b4f3/sefoxidajuvisimevalil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bab38ff-8a66-4024-8bdc-1024fa19bfc9/the_importance_of_being_earnest_full_movie_online.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/causes_and_effects_of_soil_pollution.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/how_to_write_a_counterclaim_in_an_argumentative_essay.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/segukazuvorumikejasa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ebe879e-ac31-4244-80f9-9f04f37d05cb/florida_association_for_child_and_adolescent_counseling.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/hit_the_road_jack_lyrics_and_chords.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f2756f2-6a07-403c-b0c1-46ac3f70d5ce/94602774453.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/40225393316.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_off00014e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E52 5296 bytes
SHA-256: aa479e96ed25912668916d2921c66d677c5d5cb7634ff0620e91d6944e4e5781
font_01_sfnt_off00016063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16063 10884 bytes
SHA-256: df07c348a2ed8a29ae3ae0f5578a771188b1adca46955d76a54810a41f25d2d8

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