Malicious PDF — malware analysis report

Static analysis result for SHA-256 01132112b77a4600…

MALICIOUS

PDF

77.3 KB Created: 2021-03-10 01:48:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4b43924fa17b024cd0c95dd6cf6f83c SHA-1: db038dfed820313013adc462b4b1e88cef7d95e4 SHA-256: 01132112b77a46009b602826f544bc75015962ff9d5c1208f46c6b85a9859456
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to suspicious domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://resalured.ru/aws?utm_term=keurig+k75+clb%252Fa
    • http://pitushok.space/veneer_eroded_fontoy9ix.pdf
    • https://cdn.sqhk.co/wirowanorax/ig0jgha/moneygram_login_issues.pdf
    • https://cdn.sqhk.co/ramowejub/EhiidBS/kozadute.pdf
    • http://gipogup.sportsontheweb.net/callidae_voces.pdf
    • http://hotloveme.online/what_film_do_you_use_for_polaroid_30008xog.pdf
    • http://posurazatux.mypressonline.com/dudulojibajafuzuwebubap.pdf
    • http://securitycheckingbrowservkcom.xyz/jixowinulapit8kg5x.pdf
    • http://lolkek.xyz/detizisisuligejijeglbh.pdf
    • http://hookup756.fun/9226069703k8i5i.pdf
    • https://cdn.sqhk.co/wowasuperan/eGggGhg/minecraft_1._7_2_full_version.pdf
    • https://cdn.sqhk.co/kobewudojuvo/e4lUhhy/38318227428.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tirimofufemukat/fegabejevukalute.pdf
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_b55dfabcd0ca43ffa26a188dab6bdda1.pdf?index=true
    • https://s3.amazonaws.com/xeropizuwe/vadanutodibifopovuwufuv.pdf
    • https://4e33067b-0f13-4bed-bb9c-ea95f768fd7c.filesusr.com/ugd/23924c_76d23581f3d146f0a046083b3967ea67.pdf?index=true
    • https://s3.amazonaws.com/xapijifas/nexam.pdf
    • https://s3.amazonaws.com/kufazete/15298611395.pdf
    • https://s3.amazonaws.com/fidefofudi/java_jdk_macos.pdf
    • https://9fbeb193-358d-48fe-b9d9-45f8b63f6b3c.filesusr.com/ugd/ab67b9_90eea866bf2a4b6d969987f8e4205bb7.pdf?index=true
    • https://s3.amazonaws.com/wewiro/buraredokakagosip.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_off0000f2ae.bin
effe4629f87e84ed773f07dcc0ae6074c08bdfd949fea12b8a40ac1c21963cae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AE 5204 bytes
font_01_sfnt_off0001048f.bin
4b8e40cf9815e7726266082de8d72e95a84aef44ce2a179a7bc7967e79906f88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1048F 10412 bytes

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