Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac996906ddc8786…

MALICIOUS

PDF

74.8 KB Created: 2021-01-01 06:17:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f442076e49ddd951c5c2f028ed99cd24 SHA-1: 2b6bc708c5522058ed388887cf311aae805f079c SHA-256: cac996906ddc8786a8f33a2ab9cec104b619bdccfe1a91461ff89f4cf1c9ca06
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document exhibits characteristics of a phishing lure, specifically using a fake download prompt for a ringtone to entice users. The presence of numerous external links, including one pointing to a potentially malicious PDF, and the 'Password-protected archive handoff' heuristic strongly suggest an attempt to deliver a secondary payload. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious intent to trick users into downloading and potentially decrypting malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://trafffe.ru/strik?utm_term=cool+funny+notification+ringtone+mp3 PDF link annotation
    • https://cdn.sqhk.co/lamajemomu/nE1Ljdj/magogofok.pdfIn PDF document text
    • https://xevibobi.weebly.com/uploads/1/3/4/6/134683071/wejapilozavox.pdfIn PDF document text
    • https://xigujevaw.weebly.com/uploads/1/3/4/7/134701692/netoxuv.pdfIn PDF document text
    • https://cdn.sqhk.co/miwizawi/gfY0ihl/59119489614.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3047dbde-b35f-4d09-80c5-d90bd743dc96/wolone.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/bosowog.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/photoshop_2019_brushes.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/29192048825.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/vatikumuposapezel.pdfIn PDF document text
    • https://s3.amazonaws.com/gozega/psychological_ergogenic_aid.pdfIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/waketabafenotis.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/accident_report_form_18_of_factory_act.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/bathukamma_dj_songs_2018_naa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37f0b085-f30a-4c8c-b221-16ed77aaa3df/14072364283.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE859 5328 bytes
SHA-256: 08cbe20cea4088398bf6e75fb7ba9f4b2d31d2bf963c2b027ca9a56e68799715
font_01_sfnt_off0000fa7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7C 10564 bytes
SHA-256: 94d8061a75a89a70f81aa2352e64d328888d05f060bdb5e4ee32b0d028324a92

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