Malicious PDF — malware analysis report

Static analysis result for SHA-256 185cf9ab2442fd47…

MALICIOUS

PDF

91.7 KB Created: 2021-04-03 05:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3d0db6775bf985564e70166dde139a4e SHA-1: 7d530e94770b83286eae347e0f74f52c6765f999 SHA-256: 185cf9ab2442fd4716a4fd812efda82d038b25b16b86cb079f20ef563ab7c92e
186 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The presence of embedded URLs and the overall structure point towards an attempt to lure users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://dugedepap.ru/award?keyword=charles+hodge+systematic+theology+pdf PDF link annotation
    • http://falorilipeb.mywebcommunity.org/learn_to_write_arabic_calligraphy_omar_uddin_download.pdfIn PDF document text
    • https://vorexumezekadan.weebly.com/uploads/1/3/0/9/130969740/zozir.pdfIn PDF document text
    • http://alkim.xyz/mumovaralaze6hiht.pdfIn PDF document text
    • https://cdn.sqhk.co/kuniremolu/EYghhjZ/kojemibegimezid.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/hangd15/62679060913.pdfIn PDF document text
    • http://vizilirudigub.getenjoyment.net/identidades_trigonometricas_pitagoricas_reciprocas_y_cociente.pdfIn PDF document text
    • http://1xbets-regs.site/clash_of_clans_hack_online_2018um4zl.pdfIn PDF document text
    • https://retinagarar.weebly.com/uploads/1/3/4/3/134319249/gorixegu.pdfIn PDF document text
    • http://wijasagasipode.getenjoyment.net/kaantasan_ng_pang_uri_worksheet_grade_3.pdfIn PDF document text
    • https://bagibobujinokat.weebly.com/uploads/1/3/5/3/135312275/bemadapivededul_ranapovesubod.pdfIn PDF document text
    • http://dithetsen.xyz/physics_for_scientists_and_engineers_randall_knight_4th_editionl8cgv.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwopazeg/Sjeicfc/vunoxunidikuw.pdfIn PDF document text
    • https://cdn.sqhk.co/debaviriku/iehfjfh/66267120252.pdfIn PDF document text
    • http://eeeeeyyy.space/vavedaxafipeniwezonicutqp.pdfIn PDF document text
    • https://piximemob.weebly.com/uploads/1/3/4/3/134371032/f1e161b6a700ce.pdfIn PDF document text
    • https://cdn.sqhk.co/noxivudeva/jbKDjbO/69962730876.pdfIn PDF document text
    • https://cdn.sqhk.co/nosuterib/jahkha1/75995826604.pdfIn PDF document text
    • https://cdn.sqhk.co/vomisape/9miaE94/ncdpi_2nd_grade_math_standards.pdfIn PDF document text
    • https://cdn.sqhk.co/dasisogi/ie0jeij/biaya_beli_pulsa_lewat_m_banking_bca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xologikaju.atwebpages.com/broadcast_media_meaning.pdfIn PDF document text
    • https://edefa294-c65c-46c5-840b-8a4669b9fdfe.filesusr.com/ugd/e4a001_669857ceed614394b5fcd90c4b71f80a.pdf?index=trueIn PDF document text
    • http://sidepojedava.myartsonline.com/jiririgozufow.pdfIn PDF document text
    • https://c534e673-b245-4a6d-8787-855fe96db707.filesusr.com/ugd/e19215_a7e331d2cc264513a71c0903a2023aab.pdf?index=trueIn PDF document text
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_97b11be988cb40e2befae8451a9dbb16.pdf?index=trueIn 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_off000126f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F1 5576 bytes
SHA-256: 63997634734549de5c03b87cf2d4ae1542a98480686525c29a82652bf5ab3332
font_01_sfnt_off000139c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C3 11060 bytes
SHA-256: 7ee4d62c90a688fcadf80994bc9ae2730600972420b8a3d5c4bba7da1b5c1321