Malicious PDF — malware analysis report

Static analysis result for SHA-256 721a17a3335d2648…

MALICIOUS

PDF

77.9 KB Created: 2021-02-13 08:38:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0b22cd6e22e55b085a1911993a8284c7 SHA-1: cc6f95be8fb7c5567d0fddbc37fcfd845dc5e507 SHA-256: 721a17a3335d264806a063b0a7f4b9f179d0a492e8192fde609a94716c93bc03
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains or using UTM parameters, indicating a link farm or SEO manipulation scheme. ClamAV and ML classifiers identified the PDF as malicious, likely a phishing or trojan delivery mechanism. The presence of numerous external URIs suggests an attempt to redirect users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/aws?utm_term=kotpal+invertebrate+zoology+pdf PDF link annotation
    • https://rinixupikexem.weebly.com/uploads/1/3/4/0/134096042/gesevamavowan.pdfIn PDF document text
    • http://lessonsonline.site/police_reports_brattleboro_vtz5lth.pdfIn PDF document text
    • https://cdn.sqhk.co/filodomazora/6jalPgi/29220764969.pdfIn PDF document text
    • https://sufojise.weebly.com/uploads/1/3/0/7/130739234/vepev-gigoj-zixasugadezefex-gudabadoj.pdfIn PDF document text
    • https://cdn.sqhk.co/mimotulifoti/M737ggm/kaiser_permanente_housekeeping_jobs_sacramento.pdfIn PDF document text
    • https://vosuzupitozom.weebly.com/uploads/1/3/5/3/135313705/gakuk_tiwavurel.pdfIn PDF document text
    • https://vesumuzuvof.weebly.com/uploads/1/3/4/6/134685641/fivotubiratox-pewivudibire-tarun.pdfIn PDF document text
    • https://tetiwaxope.weebly.com/uploads/1/3/0/7/130776033/sitadekifo_wotexinakeral_xuzijebaz.pdfIn PDF document text
    • https://cdn.sqhk.co/fefuxumito/e3ugiha/32923082679.pdfIn PDF document text
    • https://muxuredoli.weebly.com/uploads/1/3/1/3/131380086/7354470.pdfIn PDF document text
    • https://verulofu.weebly.com/uploads/1/3/4/0/134012380/58bdb1d.pdfIn PDF document text
    • https://bewapuvin.weebly.com/uploads/1/3/1/4/131453684/2250206.pdfIn PDF document text
    • https://fevolubepekero.weebly.com/uploads/1/3/2/3/132303134/9050567.pdfIn PDF document text
    • https://panusefebile.weebly.com/uploads/1/3/5/3/135331690/4577721.pdfIn PDF document text
    • https://lezevonunibo.weebly.com/uploads/1/3/4/5/134577944/kuwesug.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/sizadagazagaj/sentence_diagramming_direct_and_indirect_objects_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/64152682464.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/62022347997.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE424 2960 bytes
SHA-256: ba9dd86ad06677ef82b9fc66565cbe1db364e5caa8fb73f24ce3e10b7ab9a08b
font_01_sfnt_off0000eea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA7 5352 bytes
SHA-256: eb6b07442c7a64958f94121de25c89bfe24b40769b8617dd1ce791d691e65d30
font_02_sfnt_off00010105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10105 11400 bytes
SHA-256: da23eb722ec732b5326ce5324433252f10621d7bc728e5ebf8717129962d5dea

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