Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf33e1f066d69a54…

MALICIOUS

PDF

70.6 KB Created: 2021-06-01 17:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4ba276e061cabe846ed5a4edc01cef7d SHA-1: 5afb46b8fe6b5188184deb35cd7ed48eb998f323 SHA-256: cf33e1f066d69a547685bfe32a314ca4a837ce517451fca760107bb4d40d1e97
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9991

Heuristics 5

  • 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 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://medvor.ru/pbw?utm_term=msi+n1996+motherboard+drivers+for+windows+7+32+bit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4499334/normal_6026381928d04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475382/normal_5fd8fd08f0e59.pdfIn PDF document text
    • https://rotutipugav.weebly.com/uploads/1/3/4/7/134750083/funabewobofa_tajoduvakaromab_duneba_wotuwameroduv.pdfIn PDF document text
    • https://lajezufil.weebly.com/uploads/1/3/4/6/134636359/junenidefubarop_fupovobokab_pewite.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472484/normal_6009319262a09.pdfIn PDF document text
    • https://refamulu.weebly.com/uploads/1/3/4/8/134886446/torilod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474979/normal_5fca8dd35c4ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454051/normal_5feeb9f365f93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369904/normal_602d657920551.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424645/normal_605d6af87d361.pdfIn PDF document text
    • https://pifavakibapel.weebly.com/uploads/1/3/0/8/130814246/kabofulerujive.pdfIn PDF document text
    • https://jewevugaxezi.weebly.com/uploads/1/3/5/9/135967143/daa7a9.pdfIn PDF document text
    • https://wawizaliw.weebly.com/uploads/1/3/3/9/133986908/xupawekilejuru.pdfIn PDF document text
    • https://figiroxofidun.weebly.com/uploads/1/3/0/7/130740151/toxajibeb-lofali-laliwozigakux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366304/normal_5ff6624ad2946.pdfIn PDF document text
    • https://tikefukexizuse.weebly.com/uploads/1/3/4/8/134879623/gunik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dipoziw.pbworks.com/f/namofufivamukax.pdfIn PDF document text
    • http://sodopateduke.pbworks.com/w/file/fetch/144427029/what_is_pipe_and_map_in_angular_7.pdfIn PDF document text
    • http://zemenifinabe.pbworks.com/f/pisubu.pdfIn PDF document text
    • http://zexowisam.pbworks.com/f/netflix_para_android_7.1.2_tv_box_apk.pdfIn PDF document text
    • http://supatibu.pbworks.com/f/coffee_shop_cleaning_checklist_template.pdfIn PDF document text
    • http://sinorodolu.pbworks.com/f/how_to_get_a_free_auto_clicker_for_roblox.pdfIn PDF document text
    • http://wemekojezum.pbworks.com/f/jinigomiwe.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/w/file/fetch/144411768/mowivar.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_off0000d2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CD 6152 bytes
SHA-256: 659bd88819ba319c25a59de15862809c1c88958c06f71132f34fffcdde3e6c11
font_01_sfnt_off0000e7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AD 11328 bytes
SHA-256: ad4f0c898ff690d23e7a8de75300b2fe4ed6e0ac60e7266f0974c60c27d626bf

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