Malicious PDF — malware analysis report

Static analysis result for SHA-256 56c9ded27891671d…

MALICIOUS

PDF

79.5 KB Created: 2021-04-04 07:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 577ac3acea98ecbaf4fee0cd6884bb36 SHA-1: 72f4bf33f63b5a1e4ae459dfa4c5268d613d734a SHA-256: 56c9ded27891671dbb89de78218b8cecc170caec9d73a36132d4c3d506547ac0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://bologen.ru/123?utm_term=vocabulary+for+ielts+speaking+test+pdf PDF link annotation
    • http://sdfafq.info/when_you_pray_for_rain_deal_with_the_mud_moviez7pjx.pdfIn PDF document text
    • https://mejodedasebedo.weebly.com/uploads/1/3/4/7/134725949/b395fa4.pdfIn PDF document text
    • http://santand-es.com/are_groove_onn_wireless_earphones_goodogr72.pdfIn PDF document text
    • https://mapunexi.weebly.com/uploads/1/3/3/9/133999872/kerare.pdfIn PDF document text
    • https://bedejoxinen.weebly.com/uploads/1/3/1/1/131163540/zigazejurikaru.pdfIn PDF document text
    • http://copyright-central-media.com/97921901772fkk9s.pdfIn PDF document text
    • http://gixanexebo.22web.org/o_liberalismo_antigo_e_moderno.pdfIn PDF document text
    • http://divugifobera.iblogger.org/27657607988.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/a60aa9bd-f4ff-4df4-bdb0-64a60bce4168/los_secretos_de_la_mente_millonaria_audiolibro_descargar_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/tricep_kickbacks_proper_form.pdfIn PDF document text
    • https://5f98d79b-b704-4ecc-a618-200e52db7f79.filesusr.com/ugd/d1a5b7_92239bd1f4134ba4a167ec0d6ff5b00f.pdf?index=trueIn PDF document text
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_202162b440c94bc584684f5e12ee6305.pdf?index=trueIn PDF document text
    • http://mopezit.epizy.com/wuzewelu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc777744-61c2-4925-b230-c6e0f4f73fd8/codes_for_olevia_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6666f8f3-f266-4353-a2ca-4947df12ecc1/rarabuzafafawufexukibi.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/ctm_hs_2800_manual.pdfIn PDF document text
    • http://zobovobewuw.epizy.com/84818569988.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/bedadudimopupaxipopozot.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/kugegikulu.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_off0000f8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BA 5596 bytes
SHA-256: 72d48a3155a2d3b5b359c69df17e0b36b183b220e71ab6a214c4183fc7f988be
font_01_sfnt_off00010bdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDD 10872 bytes
SHA-256: 01f19985b64461d787b211de0d4470432445349c22a7f99b0456937e5370c1b3

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