Malicious PDF — malware analysis report

Static analysis result for SHA-256 4580eaf55dc63d98…

MALICIOUS

PDF

74.5 KB Created: 2021-05-03 00:35:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a071700724f35fd506308b05159bb3c0 SHA-1: 959645cc31a9ce9ac2c9b2d2597e7514d76a979b SHA-256: 4580eaf55dc63d988bf429bff33a50ad00d09b2ccfafad356c2e6fe38a2fb0c9
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 0.9997

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://nipisod.ru/strik?utm_term=motorola+surfboard+ip+address+sb6121 PDF link annotation
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://bitujidup.weebly.com/uploads/1/3/4/5/134598072/472306.pdfIn PDF document text
    • https://cdn.sqhk.co/teketerep/mvLpTig/eatme._io_mod_apk_3._8._5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497372/normal_600a5f0a845ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413563/normal_6040e4e731367.pdfIn PDF document text
    • https://cdn.sqhk.co/gabironero/iera703/dowanaragobezagamawowijor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385020/normal_603fd478e3bf7.pdfIn PDF document text
    • https://ruzuwigowan.weebly.com/uploads/1/3/1/4/131453288/menuletifujojusa.pdfIn PDF document text
    • http://kersita.space/nike_air_force_1_07_mid_white_trainers_womens2tfz2.pdfIn PDF document text
    • https://cdn.sqhk.co/fafujedajir/pbaigjf/mabefiluxereralupigo.pdfIn PDF document text
    • http://lnstagramoriginal.com/send_text_messages_wifi_androidxll7q.pdfIn PDF document text
    • http://eurofamily.pro/romances_sans_paroles_mendelssohnrix60.pdfIn PDF document text
    • https://cdn.sqhk.co/wazewiput/vpjeZic/muxilibesaxupelorefopudas.pdfIn PDF document text
    • https://cdn.sqhk.co/jevamivuvugi/ghdSPB3/rakunisadugoxagolatabiren.pdfIn PDF document text
    • http://unlockdeals.shop/33810655054hwvr7.pdfIn PDF document text
    • https://cdn.sqhk.co/purilusevike/4icrggL/littlest_pet_shop_horror_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/kulamogo/d7cSsfP/xanef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/wetefezeruw.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/77778469466.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/godirugofozowefokubore.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_off0000e59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59C 5516 bytes
SHA-256: 873029cbc7933b35fa5362b6beb990b34e9a7d4838c9958b209c6eb0c1da5f49
font_01_sfnt_off0000f870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF870 10544 bytes
SHA-256: 6c46e840d668c982a671f11ac522cc0080356deda3ff78ca45658b612f251038

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