Malicious PDF — malware analysis report

Static analysis result for SHA-256 afa54264f6105ea7…

MALICIOUS

PDF

78.4 KB Created: 2021-06-01 10:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5ee416a2a48384f64d4ae3b0bc3ee1a SHA-1: 5b66a65dd3bf1f96496d987ca338c462fddb632f SHA-256: afa54264f6105ea78ca63fe632897c6a0ac1d32c4c29fc59cc168349aef87521
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or SEO manipulation tactic. The primary URL, 'https://huntic.ru/pbw?utm_term=what+is+the+price+of+infinix+note+8i', appears to be a lure to disguise the malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or a trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://huntic.ru/pbw?utm_term=what+is+the+price+of+infinix+note+8i
    • https://xizotikozuza.weebly.com/uploads/1/3/4/5/134587863/befeduzemik.pdf
    • https://dadazifetulo.weebly.com/uploads/1/3/0/9/130969312/dikajisik.pdf
    • https://kufavugozit.weebly.com/uploads/1/3/5/3/135309998/7505201.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5acfb4ce-0aa6-4388-ac79-3898cb351fc7/west_virginia_college_and_career_readiness_standards_checklist.pdf
    • http://xojipoxar.pbworks.com/w/file/fetch/144448812/70795889165.pdf
    • https://uploads.strikinglycdn.com/files/6dd60da4-ed9e-41fe-973f-9ff8dc015ac1/ejercicios_resueltos_de_permutaciones_circulares.pdf
    • http://gifavipa.pbworks.com/f/2015_vw_passat_repair_manual.pdf
    • http://lakebimutep.pbworks.com/w/file/fetch/144424245/present_perfect_continuous_tense_exercises.pdf
    • http://fodorafirig.pbworks.com/w/file/fetch/144440475/how_do_doctors_check_for_astigmatism.pdf
    • https://uploads.strikinglycdn.com/files/dedd90ae-0478-4610-8321-8b267c89c486/epson_m244a_printer_paper.pdf
    • http://jijagenaneke.pbworks.com/w/file/fetch/144438639/jofax.pdf
    • https://uploads.strikinglycdn.com/files/dab1046f-e45b-4a11-a537-f04bed4a20e4/38765091371.pdf
    • http://wixugigir.pbworks.com/w/file/fetch/144439263/kimyasal_trler_aras_etkileimler_soru.pdf
    • https://uploads.strikinglycdn.com/files/30728c6f-afee-43bc-9598-46e5b7501190/35969635620.pdf
    • https://uploads.strikinglycdn.com/files/87d53797-7d3d-4552-9e31-e02e4cb0bab4/mogikipagopozobew.pdf
    • http://bovojigu.pbworks.com/w/file/fetch/144418011/wupamage.pdf
    • https://uploads.strikinglycdn.com/files/f9b41f6b-3fb6-4d10-96eb-3b3a75170c6a/dometic_9100_power_awning_motor_replacement_instructions.pdf
    • http://xoxafepapesu.pbworks.com/w/file/fetch/144424272/generic_usb_game_controller_driver_windows_10.pdf
    • https://uploads.strikinglycdn.com/files/9ccb0dc4-59ef-43c4-8210-4563d7e69af9/blues_guitar_licks_book.pdf
    • http://lekuzax.pbworks.com/w/file/fetch/144418785/ib_biology_course_book_2014_edition_oxford_ib_diploma_program.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef9f.bin
205c7d7538cad099c05cfa8221a5a82860c63e5053e1c573fd18aa3260f5dabb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9F 5344 bytes
font_01_sfnt_off000101db.bin
b38dd90cd2334b5a8a9c3c316b4bc727708a72a7678448664d584d4991ca86fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101DB 12552 bytes

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