Malicious PDF — malware analysis report

Static analysis result for SHA-256 c21f5659fb81eb3e…

MALICIOUS

PDF

87.9 KB Created: 2021-03-01 22:37:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 505e94b33a49a4cdfe277861d6bf5254 SHA-1: 918e119c70cf45be35fa4358cbc30bde0fa7c90c SHA-256: c21f5659fb81eb3e4909bf77172ba72d7afef61ac28eca60f32e06857ba4951d
126 Risk Score

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 0.9997

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://crophysi.ru/wix?keyword=inside+job+movie+worksheet+answer+key PDF link annotation
    • http://tefitagesev.mypressonline.com/is_the_first_word_in_parentheses_capitalized.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/taco_bell_nutrition_facts_low_carb.pdfIn PDF document text
    • http://mefeteli.iblogger.org/buried_full_movie_300mb.pdfIn PDF document text
    • http://bosnoslovnoejelaniekupit.xyz/606164537790fqsb.pdfIn PDF document text
    • http://kazimibi.getenjoyment.net/sigesevoxu.pdfIn PDF document text
    • http://tewajaz.iblogger.org/50690666723.pdfIn PDF document text
    • https://cdn.sqhk.co/wefonasifaza/icNVthc/snes9x_ex_pro_apk.pdfIn PDF document text
    • https://puxofigu.weebly.com/uploads/1/3/5/3/135347112/c23939590db2d51.pdfIn PDF document text
    • https://cdn.sqhk.co/bulenupulabo/fhcqShg/service_properties_trust_hotels_for_sale.pdfIn PDF document text
    • http://usechambre.xyz/dressed_to_kill_1980_full_movielgg6l.pdfIn PDF document text
    • https://gogadumipoti.weebly.com/uploads/1/3/1/0/131070618/e8d9efb19.pdfIn PDF document text
    • https://vexefanakaxaki.weebly.com/uploads/1/3/4/8/134871487/aea8e438f69ed.pdfIn PDF document text
    • http://retafap.22web.org/brother_hl-5470_drum_reset.pdfIn PDF document text
    • https://sewizafisebe.weebly.com/uploads/1/3/1/4/131437566/lanufuzazu_fagusupumufo.pdfIn PDF document text
    • https://cdn.sqhk.co/fusajovogi/U9iaCOj/felixetuxenukijedufov.pdfIn PDF document text
    • http://bimoriz.getenjoyment.net/the_gym_teacher_from_the_black_lagoon_reading_level.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buvudateba.epizy.com/24289314496.pdfIn PDF document text
    • http://pesetunal.onlinewebshop.net/musot.pdfIn PDF document text
    • http://litufowanukoro.epizy.com/86166769036.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DD 5504 bytes
SHA-256: 3186927dff94b3cce40a9f47ab239eb837ead75a6bc763f7cbb46f1bd2be2ff0
font_01_sfnt_off0001177e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177E 10876 bytes
SHA-256: a77a711f24b019e9f2da8a28c032da11ae5c733bb1ca552dfde08a70c369e194
font_02_sfnt_off00013ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE6 16104 bytes
SHA-256: c6d177dd30d395e9060e148723578c55e109ed4275642439632739a62bb8e54c

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