Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f14450c3ae42ab…

MALICIOUS

PDF

68.5 KB Created: 2021-03-03 22:03:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4aef8b882c17365febfaa86dca5df566 SHA-1: 76b5a50a15fdcd7709db3678cab5722b30d67855 SHA-256: f5f14450c3ae42abb50ad5e549cbd43fe164c67a2bbd46f5d34df2875147490a
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and numerous external URLs point towards a malicious document designed to lure users to potentially harmful content.

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://soxebez.ru/aws?utm_term=how+much+does+a+40+gallon+rheem+water+heater+cost PDF link annotation
    • http://7lessons.fun/92424466833luv38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492259/normal_5fe76ce0cabef.pdfIn PDF document text
    • http://pinerapidsrr.com/zeus_roman_name_and_symbols41wa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460231/normal_6033d7798552a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404297/normal_600c04ee0849c.pdfIn PDF document text
    • https://tibusikexotojuf.weebly.com/uploads/1/3/4/0/134012355/timibafazodugupukil.pdfIn PDF document text
    • https://dedodewoluxo.weebly.com/uploads/1/3/4/4/134402612/tilunofivugemu.pdfIn PDF document text
    • https://jokinurelebuvet.weebly.com/uploads/1/3/1/8/131856462/tivowonadogom_vuxinikaxosu_xedoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392872/normal_5fd324e62c514.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482188/normal_602117ce6a36c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404741/normal_5fdd6a4c8a336.pdfIn PDF document text
    • https://jexafowasefuxuv.weebly.com/uploads/1/3/4/5/134588667/lasulivixegi-setenodos.pdfIn PDF document text
    • https://jixivegeparimes.weebly.com/uploads/1/3/4/7/134749144/81f8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443799/normal_5fe64716311ff.pdfIn PDF document text
    • http://baby-slings.ru/hype_x_cyl_bluetooth_speaker_manualdtm1b.pdfIn PDF document text
    • http://balegetiwep.mywebcommunity.org/duzunugepobunikawikakuke.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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_off0000c3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A6 5472 bytes
SHA-256: d2f3a80154bedc5f0e294560a06b84072c66d395085822c65a0593fe051269b7
font_01_sfnt_off0000d629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD629 9568 bytes
SHA-256: 03d09ab75241c39315cfbbbba4cc1ed0fbe4267c513cef8b77067feb0c6592c6
font_02_sfnt_off0000f6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C6 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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