Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba9a5e28057aa74f…

MALICIOUS

PDF

74.5 KB Created: 2021-03-17 06:53:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1178c4359e8ea66ab55cdc8612b272c7 SHA-1: b165f22c337b92b77b16744d3a57b5e389206187 SHA-256: ba9a5e28057aa74f49ea9e5e11d784e214802b367f264a0833108817fe5e63d2
244 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 point to known malicious redirectors or disposable hosting, suggesting a link farm for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://crophysi.ru/award?keyword=tricky+math+education+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4404107/normal_5fe8f8d193470.pdfIn PDF document text
    • https://rutujuxifir.weebly.com/uploads/1/3/4/6/134632780/rusipazonerepulatik.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/6tidZhh/mcdonald_s_hours_near_me_covid.pdfIn PDF document text
    • http://nicechange.space/vinopodum3kt5q.pdfIn PDF document text
    • https://faturigazed.weebly.com/uploads/1/3/4/8/134859690/5945791.pdfIn PDF document text
    • http://lifegirls.site/attention_getter_for_informative_speech_on_nursingzz5y1.pdfIn PDF document text
    • https://cdn.sqhk.co/jevamivuvugi/Vjcy4hb/the_jackbox_party_pack_5_ps4.pdfIn PDF document text
    • https://cdn.sqhk.co/nekuripafi/iojhnha/fenakelujotumomiwitava.pdfIn PDF document text
    • https://sarefijinarexaw.weebly.com/uploads/1/3/4/8/134862577/wibefijif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367310/normal_603cfdde32379.pdfIn PDF document text
    • https://cdn.sqhk.co/rizijuwet/dAUhfkv/zaminijaboxinorugi.pdfIn PDF document text
    • https://cdn.sqhk.co/vamaxojurapu/sigSPgj/28370701516.pdfIn PDF document text
    • http://cmbclientes.com/platform_number_13_ndlszdpj0.pdfIn PDF document text
    • https://cdn.sqhk.co/rarukaboz/bmIjkhh/funefotilapamewunolot.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwesedujila/Agd19ia/96176152121.pdfIn PDF document text
    • https://metidesu.weebly.com/uploads/1/3/4/4/134492072/4a17000ef098240.pdfIn PDF document text
    • https://soxapibojewaw.weebly.com/uploads/1/3/5/3/135345372/e05815b254.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493579/normal_5ffeb2a89a0d5.pdfIn PDF document text
    • http://dimopun.mywebcommunity.org/30960806397.pdfIn PDF document text
    • http://creditreportusa.info/155189685914apee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xotaferuju.myartsonline.com/nespresso_aeroccino3_milk_frother_blinking_red_light.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_off0000e7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BD 5300 bytes
SHA-256: 78c0b2661e1576e82cc3e425f947ffe2d42a4bbefe2635947b620bf5f9782f0f
font_01_sfnt_off0000f9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A5 10224 bytes
SHA-256: 55aa8899b4e5cab62c02085cacb0803e86673a63ab38afcb2ca855a460692944