Malicious PDF — malware analysis report

Static analysis result for SHA-256 558b3e50fa760805…

MALICIOUS

PDF

80.5 KB Created: 2021-01-09 18:44:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c3a6dcc62008cf32597d8b762ef28e0d SHA-1: 89c9a9f5ded000d976ede9cd3d9425ac6d7fdc41 SHA-256: 558b3e50fa7608059aada428674a2909c9487966e8d2a6fd5e958145d67305dc
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains a large number of embedded links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection scheme. One critical heuristic indicates links to known malicious redirector infrastructure, specifically `https://cctraff.ru/aws?utm_term=the+sorcerer%2527+s+apprentice+movie++720p`. The ClamAV detection `Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0` further supports its malicious nature, likely involving phishing or the distribution of further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://cctraff.ru/aws?utm_term=the+sorcerer%2527+s+apprentice+movie++720p In PDF document text
    • https://dusomekekonipa.weebly.com/uploads/1/3/4/5/134580960/zuwizufigukalik-sipumelasilobop-gebalakuguzaliz-jukutorodivebe.pdfIn PDF document text
    • https://rumorima.weebly.com/uploads/1/3/4/3/134307849/wilin_dasamopij.pdfIn PDF document text
    • https://tuvexora.weebly.com/uploads/1/3/4/6/134618292/d3fee0.pdfIn PDF document text
    • https://xadixifiv.weebly.com/uploads/1/3/4/8/134888816/960984.pdfIn PDF document text
    • https://lifalaril.weebly.com/uploads/1/3/4/8/134883644/demokidakob-tukebubifeju.pdfIn PDF document text
    • https://zedaluridafam.weebly.com/uploads/1/3/4/4/134464222/d90de735.pdfIn PDF document text
    • https://wavupuzubeje.weebly.com/uploads/1/3/4/2/134235525/poraferefi.pdfIn PDF document text
    • https://ludasajuwo.weebly.com/uploads/1/3/4/0/134096591/238b114e.pdfIn PDF document text
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/4462752.pdfIn PDF document text
    • https://vojituletakez.weebly.com/uploads/1/3/0/8/130874409/2001327.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/4497345b-8f6a-4e48-b8aa-f81db8cefce2/fingerprint_word_art_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/zevituzule.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/excel_2013_view_sheets_side_by_side.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/auto_screen_tapper_android_no_root.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/swing_java_eclipse.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_off0000ebac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAC 5540 bytes
SHA-256: 93f2f8f482ab09278e0c51dbd3cb01fe16bc555ac85ef09768b9156cec8888b7
font_01_sfnt_off0000fe69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE69 19928 bytes
SHA-256: 0897d6ed5f0ac444bf6f6409a2013f554c768c0f6b39be72b73201e0dd506764

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