Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b4c88b75853f7e…

MALICIOUS

PDF

80.9 KB Created: 2021-03-15 09:49:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 985a8f2a088172de28d0c6058c92b776 SHA-1: 9d5d6c12a84eb92771be23ee49fc0fbbd2df4c20 SHA-256: c8b4c88b75853f7e55cea127e75d30873a42baad3cab23b3ec79b6504233160a
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 0.9994

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://ponafet.ru/strik?utm_term=how+to+administer+medications+via+g-tube PDF link annotation
    • http://vedakedudeloko.22web.org/69668837141.pdfIn PDF document text
    • http://waniruraguxi.22web.org/boards_and_beyond_promo_code_2021.pdfIn PDF document text
    • http://gadatoreneperil.mygamesonline.org/29584282070.pdfIn PDF document text
    • https://fumuradowije.weebly.com/uploads/1/3/0/7/130739974/zegipuj_dovipuzimewutis_xagogagujibew.pdfIn PDF document text
    • http://mailedflkf.site/komuburzqbqw.pdfIn PDF document text
    • http://pl50off.info/832158337730uh0w.pdfIn PDF document text
    • http://carbackseat.site/888461428igdzw.pdfIn PDF document text
    • http://copyright-security-ig.com/849108780088ide3.pdfIn PDF document text
    • https://saxeguwub.weebly.com/uploads/1/3/1/4/131406831/5378119.pdfIn PDF document text
    • http://grafoanaliz.ru/48913293247banz5.pdfIn PDF document text
    • http://akvatehnika74.ru/dogukimasqrat5.pdfIn PDF document text
    • http://znakomstva69.space/cisco_webex_meetings_scheduler_download1gxyy.pdfIn PDF document text
    • https://xizirujikalowev.weebly.com/uploads/1/3/1/4/131454807/6a3be74.pdfIn PDF document text
    • https://sasurejif.weebly.com/uploads/1/3/5/9/135966776/de4f9d790a5548d.pdfIn PDF document text
    • http://groby-ritual.online/45211830025tiqz3.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/zevumepaboxawun-dibedirovaraz-faxupajegu.pdfIn PDF document text
    • http://tawokurabugo.22web.org/roteg.pdfIn PDF document text
    • http://vizexibidoxi.getenjoyment.net/minelebuxolurukowonagato.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pabewuvuxaf.onlinewebshop.net/atlas_copco_compressors_houston_tx.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85af19ef-a8de-4629-95c1-6f84d1864065/how_to_create_a_procedure_manual_in_word.pdfIn PDF document text
    • http://galapeb.epizy.com/sutizekuxotepeganurek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2067c92c-23f6-48f8-b3d8-c7b3b6634dc0/officejet_5740_printer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c44a750-af33-407b-8398-da829671c5b0/914961170.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_off0001001e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001E 5512 bytes
SHA-256: 45193acc8fe08b776002be865f10cd45e44ac0dfc748395be13bf6bdb95b8797
font_01_sfnt_off000112e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E2 10320 bytes
SHA-256: ca1879a09c13e9c3af92d3652ecb6b717193b389879c62450053a7772626729c

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