Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac04fae1a69a11f…

MALICIOUS

PDF

80.8 KB Created: 2021-04-08 00:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f134b17b7d2cf20334ed6131976edb9 SHA-1: 1de8525054537bdb2cde91cca3e95430caaac51b SHA-256: cac04fae1a69a11f05d7c56e8235629fb7caaf96f63289892b8c121d16fed181
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one identified as a potential phishing lure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search engine results or direct users to malicious content. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the presence of multiple external links points towards a phishing or malicious redirection attack.

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://pelibifir.ru/strik?utm_term=what+does+conversational+mean+in+spanish
    • https://static.s123-cdn-static.com/uploads/4417221/normal_5ffb30150a14b.pdf
    • https://rasozonikazip.weebly.com/uploads/1/3/4/9/134904665/476830.pdf
    • https://dufavepuxafolim.weebly.com/uploads/1/3/4/2/134266173/8136056.pdf
    • http://kofodotig.sportsontheweb.net/word_2016_keyboard_shortcuts_not_working.pdf
    • https://cdn-cms.f-static.net/uploads/4369771/normal_600e629bd20ae.pdf
    • https://wivetagimogik.weebly.com/uploads/1/3/4/6/134618772/lugamibebipupova.pdf
    • https://bawejitomu.weebly.com/uploads/1/3/1/4/131438353/pedagosoj_lakoterenivu_nowizidoludid_negirosowuwedi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a9f3490c-def6-45ea-9957-aefa341d54bd.filesusr.com/ugd/84b587_6c4541ed0a88410ab5c0a60f627584bc.pdf?index=true
    • http://vujuvisesakok.myartsonline.com/auditing_standards_and_guidelines.pdf
    • https://uploads.strikinglycdn.com/files/bef8b51f-018e-430e-b5dc-2eb79ae2ec48/plt.rcparams_title_size.pdf
    • https://uploads.strikinglycdn.com/files/5c0dc8ee-aa95-4d0f-84af-b442575d8161/tp-link_n750_manual_espaol.pdf
    • https://53ebb62d-ddaf-432f-8dc3-1f4746653467.filesusr.com/ugd/bbd3cf_347e5fbe75dd4ecdb3c2a01773555f0d.pdf?index=true
    • https://s3.amazonaws.com/lowebemuwojiso/positive_psychology_exercises.pdf
    • https://uploads.strikinglycdn.com/files/9e5aa8ad-a207-4070-bfc9-2c46c2ab223a/john_deere_riding_mower_tune_up_kit.pdf
    • https://s3.amazonaws.com/rokuwapesu/catalina_beta_9.pdf
    • https://s3.amazonaws.com/mujevubutukoxu/69725087937.pdf
    • https://s3.amazonaws.com/fujadabez/dirugolabedigalimo.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_off0000fbe9.bin
27b9f926210fd219bed54937cb866291ae799478b79bbc61305d53b792dc1e9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE9 5388 bytes
font_01_sfnt_off00010e21.bin
3b2dad0b91f1f185192db4a9efebddb913d167b2c219cfbbaf4bb54a2d586fbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E21 11376 bytes

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