Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac761032ee816cb…

MALICIOUS

PDF

68.0 KB Created: 2020-12-01 10:03:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 6854dd90ab817853da8a9f36d8b8a9c1 SHA-1: bfd1448571f12bc3c6ab8a1a7cad721d7062174c SHA-256: 7ac761032ee816cb74d4a8681b00f886eb752bc4e5047757c03aa046dd059ee2
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external websites, suggesting a link farm or SEO abuse. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ggtraff.ru/strik?utm_term=gold%2527s+gym+stride+trainer+310+price'. This indicates a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://ggtraff.ru/strik?utm_term=gold%2527s+gym+stride+trainer+310+price In PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/8826649.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/teximikamukubo/85844082056.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/agenesia_lumbosacra.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/tusobisagupudo.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/joniwuloboratujezan.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcfa301af5bf52c327259c/1606220337695/17649433593.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/rpa_automation_anywhere_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vukujidor/reminiscent_yiruma_sheet_music_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1922363a-41af-4928-b4f5-991673600898/kowanukad.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/corona_kerosene_heater_sx-_b21a_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/adjectives_words_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/lekaf.pdfIn PDF document text
    • https://s3.amazonaws.com/suzeduselu/76821671157.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/latest_movie_bollywood_filmywap.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d7dc3dfdd95b60d4c91c/t/5fc40557145a8629dc2d9423/1606681946015/baxaven.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_off0000c964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC964 5920 bytes
SHA-256: bc95162f40e3b156973a7604f03b7e51c2965a67fd28687b02590e7fa6e26ccb
font_01_sfnt_off0000dd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD88 11016 bytes
SHA-256: 0aea88f1410aad7212436a4e37bf32c6a7ea7119d77e8c7f549c035b32bb3c31

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