Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f2862b373a3e1f0…

MALICIOUS

PDF

92.5 KB Created: 2021-03-07 14:47:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7cdb89131808ac7044d2e847b893448d SHA-1: 2cb9379ec5591db8c51c6312b402e5b108891dcc SHA-256: 0f2862b373a3e1f05b49fdd1d8bacc9bfe03a177eeb81302bffc73d7422e8b09
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded links that point to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged this PDF with a high probability of being malicious. The primary IOC is the malicious URL used for redirection, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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.
  • 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://yafferge.ru/wix?keyword=insulin+signal+transduction+pathway+steps In PDF document text
    • https://cdn.sqhk.co/titukopano/L8hdUDx/ninjago_movie_streaming.pdfIn PDF document text
    • http://ketenimolupev.sportsontheweb.net/casio_3208_ca53w_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/mugukawi/Khcjghe/scrolling_platformer_tutorial_scratch_3._0.pdfIn PDF document text
    • https://cdn.sqhk.co/bovutolomevo/ji6yqGR/final_fighter_mod_apk_android_1.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/epson_v370_perfection_flatbed_scanner_argos.pdfIn PDF document text
    • https://cdn.sqhk.co/sajatanugeg/dvzjdgd/lekizibot.pdfIn PDF document text
    • http://bawazofo.getenjoyment.net/numerical_linear_algebra_textbook.pdfIn PDF document text
    • http://ninuxalezopo.getenjoyment.net/sigmund_freud_theory_of_personality_development.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/6db697a3-99c0-44ef-ae3e-acad93b37344/iceberg_salad_calories_1_cup.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/passport_renewal_application_online_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a87383a-ec5e-44a7-9b4b-a15d1b106f70/67344661453.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/broadsword_quest_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e385459-7e2d-43de-83ef-c78e3ce3ca8c/how_to_draw_cool_and_easy_symbols.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/drawing_the_head_and_figure_jack_hamm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5b33153-5a9e-458e-9a9d-36c4fc580d63/nuripusefanawezidimi.pdfIn PDF document text
    • http://levapoloj.onlinewebshop.net/78701023337.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa3c5af0-570e-4844-b7c1-62b79a7c3279/rubariza.pdfIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/logokemiminegovixew.pdfIn PDF document text
    • http://rijemow.onlinewebshop.net/29515265852.pdfIn PDF document text
    • http://zeteximezoxa.myartsonline.com/how_much_do_airmen_make_an_hour.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd9e8664-b948-414f-abdb-8093c5eba424/lenotijalukakuje.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_off00012c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3D 5464 bytes
SHA-256: 4bcc1dcd557b2698fe8f86055f0ac3dfc677dfbadfac209c01454a857788d139
font_01_sfnt_off00013ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE5 11064 bytes
SHA-256: 25cb64f8174e6f809bad4e22f3c12d27470aecfe8900a428a712e59a51b848ad

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