Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a500fc3b0df4490…

MALICIOUS

PDF

76.6 KB Created: 2021-03-16 13:42:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5887bfa1902f6d9133b0ae9075a33298 SHA-1: 50f9fcecd2b0957a451c25b42dbf2c8daffd608c SHA-256: 5a500fc3b0df44903e969fb001736e6ebb98cfabf53b520662babd3c8c618df5
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm designed to attract search engine traffic. The primary URL, 'https://baarspo.ru/wix?keyword=rollercoaster+tycoon+4+mod+apk+unlimited+money', indicates a lure for potentially unwanted software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/wix?keyword=rollercoaster+tycoon+4+mod+apk+unlimited+money
    • https://cdn-cms.f-static.net/uploads/4392463/normal_6035d8eb4d36c.pdf
    • http://marafonsport.site/tcnicas_de_redaccin_de_informacin_ortografa_y_sintaxisarr74.pdf
    • http://abanca-electronica.com/40512490056vfnut.pdf
    • https://cdn-cms.f-static.net/uploads/4378152/normal_60236ffa976bf.pdf
    • https://vatedubajepe.weebly.com/uploads/1/3/4/3/134371970/xopavi_budedejeg.pdf
    • https://tidijesugeji.weebly.com/uploads/1/3/4/7/134764535/cfffbf2201f9d.pdf
    • https://litodamun.weebly.com/uploads/1/3/4/7/134710511/9c6d2937.pdf
    • https://koneligave.weebly.com/uploads/1/3/4/5/134581264/voreburasimonofaxuji.pdf
    • https://gebekogekikak.weebly.com/uploads/1/3/4/6/134694855/4157690.pdf
    • https://doxemikawapuki.weebly.com/uploads/1/3/4/3/134314999/lexezozupovosa-memazefe-fiwuf.pdf
    • http://sunepoxuvigos.66ghz.com/81347582510.pdf
    • http://vivoxasoro.22web.org/66359119422.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zezilometup.epizy.com/41125508212.pdf
    • http://solujenujaki.epizy.com/kosazakonireti.pdf
    • http://suwulinivez.rf.gd/87539773279.pdf
    • http://luwusifijusu.rf.gd/94293137767.pdf
    • http://wevoxefi.epizy.com/67309262255.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_off0000ecfc.bin
96f3c82f5174244d4e9b355919a9d92f1bafd8ca1b0a830a86dae2a2da1d9c2d
pdf-font-stream PDF embedded font (sfnt) at offset 0xECFC 5480 bytes
font_01_sfnt_off0000ff9e.bin
6a7cbd3dfafa6e6779727eb9a25b40c1b5052d60ce73e221e1f7470c587101cb
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9E 11196 bytes