Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af0873776f48040…

MALICIOUS

PDF

80.1 KB Created: 2021-03-31 07:41:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcb8f8f9c167b00a7abfb29e5dcc7cb7 SHA-1: 9ed66ac9e6ab222bb3af417e2545b41c35d621f8 SHA-256: 4af0873776f480407702c0466e722613843f5754e258da9efeed533151620f00
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms and phishing. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URL `https://jumiwimov.ru/aws?utm_term=how+to+store+pool+filter+for+winter` suggests a phishing or malicious content lure, disguised as a helpful article.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/aws?utm_term=how+to+store+pool+filter+for+winter
    • https://xufetujada.weebly.com/uploads/1/3/4/7/134745175/bea9c9a69c6.pdf
    • https://kukibujez.weebly.com/uploads/1/3/1/6/131637652/cfad71b0.pdf
    • https://jafobepajimo.weebly.com/uploads/1/3/4/8/134881918/ce9d1c07.pdf
    • https://nikirepe.weebly.com/uploads/1/3/4/7/134743809/4933094.pdf
    • https://soravetojovon.weebly.com/uploads/1/3/4/8/134890923/duwimenejemiduter.pdf
    • https://vixevugipun.weebly.com/uploads/1/3/5/3/135327752/68c2119eb.pdf
    • https://fejamelaluboj.weebly.com/uploads/1/3/4/3/134311679/d5fbff02507e727.pdf
    • https://pozemake.weebly.com/uploads/1/3/0/7/130776760/cf897bc8047.pdf
    • http://dragonflysagewellness.com/92839460341gitjb.pdf
    • http://rodina38.ru/will_sky_install_a_hybrid_lnblm19s.pdf
    • https://zevofukuje.weebly.com/uploads/1/3/4/5/134585027/3699686.pdf
    • http://repaircreditscore.info/el_vendedor_mas_grande_del_mundo_frases_gratisx0dli.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rovuweraja/lufezomipabidofejubizi.pdf
    • https://s3.amazonaws.com/minabiwa/how_to_document_business_processes_template.pdf
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_ccc345068939453184ece0cbaf0dadbc.pdf?index=true
    • https://s3.amazonaws.com/zubuwujoxom/solenoide_mircea_cartarescu_gratis.pdf
    • https://37791e41-adf9-4b10-971b-12120b55a2dc.filesusr.com/ugd/8c5bc8_7df233ed6822430caed518fa6a75ea36.pdf?index=true
    • https://s3.amazonaws.com/limewub/memupoduvevatebabifi.pdf
    • https://s3.amazonaws.com/fadobirak/court_of_thorns_and_roses_synopsis.pdf
    • https://2c549fd3-bbcc-4e43-aea5-84609313cfd4.filesusr.com/ugd/c162b3_b9b5f00892774b399cb1075b83fa7180.pdf?index=true
    • https://s3.amazonaws.com/fedure/template_wedding_invitation_video_powerpoint_free.pdf
    • https://s3.amazonaws.com/zafirawit/womesegoda.pdf
    • https://s3.amazonaws.com/jivuxo/abandono_afetivo_psicologia.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd5c.bin
b8c2005c1f12220e088c5b6087f2eb4cd0ae43b6f32af22af206eed62c365d6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5C 4740 bytes
font_01_sfnt_off00010d9c.bin
8ba4264b543e938c005cfb071d77ab812b66eb73146f76d2b0f9aef8fa417dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9C 11292 bytes

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