Malicious PDF — malware analysis report

Static analysis result for SHA-256 41bf2cc99e78f284…

MALICIOUS

PDF

108.5 KB Created: 2021-03-30 10:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9ae4ae030ee0cae0f0431036428dc793 SHA-1: 3f3c6d7bdeb449b3723a9b9d43eb751ef642eaeb SHA-256: 41bf2cc99e78f284bf81bb64499203a26fcd1ff5400d2959bea611696ea81ebe
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and redirectors, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites. No scripts were extracted, but the presence of embedded URLs and the link farm heuristic point to a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • 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/award?keyword=child+and+adolescent+development+psychology+pdf In PDF document text
    • https://cdn.sqhk.co/gupuwiwi/UZC2ggg/bass_pro_shop_near_melbourne_fl.pdfIn PDF document text
    • http://xefijemav.iblogger.org/grant_morrison_pop_magic.pdfIn PDF document text
    • https://xoxudepibedewem.weebly.com/uploads/1/3/5/3/135317482/xapajip_xirowawe_nelegogaperawo_mujitoze.pdfIn PDF document text
    • http://wunetebevuwotek.iblogger.org/tips_and_tricks_for_sat_math_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/meletadugox/hhetijh/70071388369.pdfIn PDF document text
    • http://tinizorejit.22web.org/kakakunejamibije.pdfIn PDF document text
    • https://cdn.sqhk.co/bedogipaxog/3igibjh/space_engineers_ion_tug_ship.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449193/normal_601c7d000a256.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460045/normal_5fc641003f68c.pdfIn PDF document text
    • http://noxivivixuza.22web.org/mr_coffee_iced_tea_maker_3_quart_replacement_pitcher.pdfIn PDF document text
    • https://cdn.sqhk.co/juwafajem/fxJNheR/moxanevaropimub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426819/normal_6014d5076fe00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466153/normal_5fdea3c7aa73b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420764/normal_5fd22aca0e8ea.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/Zicxjdu/56690084238.pdfIn PDF document text
    • https://pavonaxasove.weebly.com/uploads/1/3/5/3/135310158/2f6df560932.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_ae99ecdfe03147d09d4926946f30982e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/21c925ea-532a-415b-abdb-1e13cf2cf191/temas_adventistas_en_power_point_para_descargar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4f01c9a-1d32-4d28-b0b3-c4a0815e558a/98747124786.pdfIn PDF document text
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_1ec09301f81444539c997359a6ab21e5.pdf?index=trueIn PDF document text
    • https://2703069b-a6ff-4ff9-983c-db139a8d76ba.filesusr.com/ugd/8b61cf_8bda8a7a94c0405cac948fa6feb0932e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1517cd06-cd3c-4920-9e3e-1fbdaf5013a5/go_where_you_feel_most_alive_quotes.pdfIn PDF document text
    • http://xorirefojexo.rf.gd/the_complete_auguste_dupin_stories.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_off00016be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BE6 5540 bytes
SHA-256: a28acd3d0b1db78f55079f2d4d048255b8a1eb7478db9e134609503c7ec547b2
font_01_sfnt_off00017eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EAF 10752 bytes
SHA-256: 5bc894a5622c34bee9b80608bf1e406fd8c3c642418e4907ec6157c33711373e