Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a2724eec79530e9…

MALICIOUS

PDF

87.8 KB Created: 2021-01-15 06:22:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d895cadd4209eba0c183717f706c969e SHA-1: 6f07da7fede714a7ae76020874ce1c808d8481de SHA-256: 8a2724eec79530e9763866600c16dd5590079b661eacc07f5c4856de47bb71d0
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in SEO poisoning or link farm attacks to direct users to malicious websites. The heuristic 'PDF_SEO_LINK_FARM' specifically indicates a large number of external PDF links, with the primary malicious URL being 'https://trafffe.ru/aws?utm_term=santa+biblia+reina+valera+pdf'. This suggests the document is designed to trick users into clicking through to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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.
  • 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/aws?utm_term=santa+biblia+reina+valera+pdf PDF link annotation
    • https://mokowevabib.weebly.com/uploads/1/3/0/7/130739664/7686339.pdfIn PDF document text
    • https://site-1188771.mozfiles.com/files/1188771/diririxuvekemimaka.pdfIn PDF document text
    • https://site-1175077.mozfiles.com/files/1175077/9368435445.pdfIn PDF document text
    • https://cdn.sqhk.co/jowapezo/Whciigj/84192176505.pdfIn PDF document text
    • https://manabaxijex.weebly.com/uploads/1/3/4/6/134626004/vaxujujixorix.pdfIn PDF document text
    • https://cdn.sqhk.co/rigowodikot/hdyjhf8/takatumixabojusuzizevo.pdfIn PDF document text
    • https://jedidaril.weebly.com/uploads/1/3/4/6/134687024/kuzola-pupubatin-foloda.pdfIn PDF document text
    • https://site-1178979.mozfiles.com/files/1178979/zuxukenadok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kuboki/how_to_use_vlookup_across_multiple_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/ladudu.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/60960487139.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/xekogo.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/39537121724.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F00 3480 bytes
SHA-256: 28434a4da40cb238908ea6356c5e8f321f59eb2f6ad2923eda77f84f82d21f04
font_01_sfnt_off00011b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7B 5160 bytes
SHA-256: 7395dce0a4094bacb9a9799d43ec7a9d8a9c95291288391c33a336b1ab27d34c
font_02_sfnt_off00012d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D19 11104 bytes
SHA-256: da75d1765ae52956bdeef8703011697a5941b215714423fff5e37df5bfd133fc

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