Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ed45fa911157a59…

MALICIOUS

PDF

75.7 KB Created: 2021-02-16 04:46:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7a4aea5507236518e15d38d0aea183d7 SHA-1: a9bfd569cf252b68f7312921235a05727952f2c4 SHA-256: 2ed45fa911157a59b1baf11ccddaaee29fe5eeff46aa209b100d3412b80b05f7
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to external PDF files hosted on disposable domains, suggesting a link farm designed for SEO manipulation or to distribute malicious content. The presence of a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK and ClamAV detection further indicates malicious intent. The document body, though heavily obfuscated, contains text related to downloading a PDF, aligning with the link farm's apparent purpose.

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
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://yafferge.ru/strik?utm_term=clint+emerson+100+deadly+skills+pdf+free+download In PDF document text
    • http://leopolds.space/beamer._cls_latexxvt5c.pdfIn PDF document text
    • https://rifodajawu.weebly.com/uploads/1/3/0/7/130739776/a240d342313d4.pdfIn PDF document text
    • https://gawajofanobovap.weebly.com/uploads/1/3/5/2/135296378/rafub.pdfIn PDF document text
    • https://biligimanud.weebly.com/uploads/1/3/1/4/131454089/ferebed.pdfIn PDF document text
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/c7643326.pdfIn PDF document text
    • https://dedidebu.weebly.com/uploads/1/3/2/7/132740692/kuxamaxefisafejove.pdfIn PDF document text
    • https://fotelixufigowex.weebly.com/uploads/1/3/1/0/131071188/591282.pdfIn PDF document text
    • http://copyrightshelpcenter.com/battle_disc_5_bombs_2_levelsn34ed.pdfIn PDF document text
    • https://vulodimov.weebly.com/uploads/1/3/4/8/134880101/1256011.pdfIn PDF document text
    • https://wekisakalew.weebly.com/uploads/1/3/4/6/134617168/091c8fe4e.pdfIn PDF document text
    • https://fukenotaza.weebly.com/uploads/1/3/2/7/132740373/24d51918b64c4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ravuxisopol.rf.gd/49416827439.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/fundamental_chemistry_book_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/fawenirebifixobowo.pdfIn PDF document text
    • http://gowatane.rf.gd/coreldraw_x8_home_and_student_user_guide.pdfIn PDF document text
    • http://litujomotoju.epizy.com/bonaxodafezanaxexab.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_off0000e991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE991 5544 bytes
SHA-256: 1c42659a8542fef1838fb82ba11ac9a7ec5f985014c7e01d9a748273e6c99962
font_01_sfnt_off0000fc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC72 10940 bytes
SHA-256: a045edf1c77b35cefb543e997c2f5aaf2bba8add4539e8588d8ccda227c23e90

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