Malicious PDF — malware analysis report

Static analysis result for SHA-256 5664fab2cfe96ad2…

MALICIOUS

PDF

73.7 KB Created: 2020-12-17 20:39:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1cb17209d0ae26b91e79f441207fa0d2 SHA-1: 53f9f51cb70aef61f0bbd62fa251bcd158fb7df8 SHA-256: 5664fab2cfe96ad2bdab958cb6a3e72542bf59853eba4e3a34b0f442ab8c3609
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, specifically flagged as a redirector and a link farm. It contains numerous embedded URLs pointing to disposable hosting and a known malicious redirector, suggesting an attempt to lead users to malicious content or phishing pages. No scripts were extracted, but the structure and embedded links strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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.
  • 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://traffmen.ru/strik?utm_term=kicks+and+giggles+maine
    • https://vixikubinimagap.weebly.com/uploads/1/3/3/9/133997110/zupazobuvidavigigi.pdf
    • https://fidumozif.weebly.com/uploads/1/3/4/7/134715024/desujumoz_lujejopali_powokajipot.pdf
    • https://wozibasibif.weebly.com/uploads/1/3/4/8/134868806/4733970.pdf
    • https://rikidunojig.weebly.com/uploads/1/3/4/4/134488605/8417412.pdf
    • https://xabisemegebo.weebly.com/uploads/1/3/4/4/134491474/8284999.pdf
    • https://nubojubixuxo.weebly.com/uploads/1/3/1/4/131410311/sigepe_dibogasufufan_bagezibome_vebotokafix.pdf
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/5827050.pdf
    • https://pejagefetem.weebly.com/uploads/1/3/0/8/130815482/7490ae244.pdf
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/zonibopiwesi.pdf
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/024c5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wokesabisevo/juviw.pdf
    • https://uploads.strikinglycdn.com/files/8d18ad6a-8d11-45a6-9107-b4e7a73128f6/luwedemamuzibogi.pdf
    • https://uploads.strikinglycdn.com/files/acd0b33b-5d40-467e-b724-d93e097b6e2f/science-teachers.com.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c961.bin
aa5672ebe907f2dc1c2979791f9a99c3d8a9eabfc0a390618725e37c0421f9f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC961 5196 bytes
font_01_sfnt_off0000db05.bin
1ca1d2fad4c93a7dc18cb0a41ab61a21d53ebb0355bd01295ba4cde2ae90487e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB05 11156 bytes
font_02_sfnt_off00010080.bin
f6d9d20f7e6f28da557b250ba25d9543399e043485410be34120ea0cf9bf7149		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10080 17336 bytes

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