Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef9b6644ba172d3…

MALICIOUS

PDF

66.1 KB Created: 2021-02-14 11:06:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 33b1fadd4e1b656dbe19d40a58ac4087 SHA-1: 5c52d7c4f891919002512883638c00d733272898 SHA-256: aef9b6644ba172d3af25b2fa7d2d238f1115cf429a662b31361d82c235b65478
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to disposable hosting services, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as 'https://leonvi.ru/wix?keyword=aps+edu+blackboard+login', are likely used to redirect users to malicious sites 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://leonvi.ru/wix?keyword=aps+edu+blackboard+login PDF link annotation
    • https://toxoladosa.weebly.com/uploads/1/3/4/4/134479392/nalepinunaj.pdfIn PDF document text
    • http://arm-watch3.club/mosotelenuzupaxuklsr6y.pdfIn PDF document text
    • https://rapodiduwegez.weebly.com/uploads/1/3/5/3/135311990/gugavomomiga-jixopozunajem-fulotiwubomupe.pdfIn PDF document text
    • https://puvomowaja.weebly.com/uploads/1/3/4/3/134318832/netiloran_monunusufume_jakomimumoluxog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387241/normal_5ffa5c2a6ca82.pdfIn PDF document text
    • http://on-arenas.com/mortgage_amortization_schedule_spreadsheet_templateujdtg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414352/normal_5feb621e2e118.pdfIn PDF document text
    • https://turarizamagux.weebly.com/uploads/1/3/1/4/131453837/68a4679ba9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388183/normal_5fcc7d065bdc3.pdfIn PDF document text
    • http://sunepoxuvigos.66ghz.com/ziwifomutep.pdfIn PDF document text
    • https://tunedewujanan.weebly.com/uploads/1/3/5/3/135345761/92b95789e12d.pdfIn PDF document text
    • https://faneboluti.weebly.com/uploads/1/3/4/4/134464249/7847b1da.pdfIn PDF document text
    • https://dakubazelup.weebly.com/uploads/1/3/1/4/131454222/caaa243e.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/sazomo/blender_2._77_for_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/microsoft_activesync_win_10.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/canopus_edius_7_software_free.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_off0000c65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC65E 5436 bytes
SHA-256: 7e5178472fe98767c6bf4de7a85f7059d8f2a0622a0397d1bcd2604c2ed2dab8
font_01_sfnt_off0000d8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E2 10040 bytes
SHA-256: 4902ccc36dfc57c76cdcf0bc8c4b42ea872c2ca210e2235ec58f7aac0fe83142

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