Malicious PDF — malware analysis report

Static analysis result for SHA-256 45368cd5514c2179…

MALICIOUS

PDF

76.9 KB Created: 2020-11-14 22:43:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 462839c751220b243a67f25d3e0bfacf SHA-1: 9600e8f6857ef130a68be65344f35d347f891bc7 SHA-256: 45368cd5514c21792f2811f0276ad44a414e6ce881819a8a4ea993fcc492207d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • 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.
  • 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://trafficel.ru/strik?utm_term=the+runaway+dinosaur PDF link annotation
    • https://tuzafezinaxav.weebly.com/uploads/1/3/4/3/134319976/tagoxulesaniboben.pdfIn PDF document text
    • https://fijateri.weebly.com/uploads/1/3/4/3/134371572/rozuxig-vifuwitisuju-kinapiworulu-libikefinaz.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/1158663.pdfIn PDF document text
    • https://xelenupexom.weebly.com/uploads/1/3/4/4/134480667/kejefizikuzuvi.pdfIn PDF document text
    • https://nonuvatemex.weebly.com/uploads/1/3/4/4/134443968/vewobexuveru.pdfIn PDF document text
    • https://rosikotukixaru.weebly.com/uploads/1/3/4/3/134312973/7604605.pdfIn PDF document text
    • https://selubigal.weebly.com/uploads/1/3/4/5/134518702/e73e9829.pdfIn PDF document text
    • https://relulime.weebly.com/uploads/1/3/4/3/134384492/fuvajapetod.pdfIn PDF document text
    • https://wofexexugov.weebly.com/uploads/1/3/4/3/134318452/4805810.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/cf071de2-a89f-4653-a900-1112b2018d07/miweberumepupelegesib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ab511c6-91d4-405e-857f-e34dcf565fdd/gosimuxuwol.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/analytical_skills.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/047f46f6-d2a8-45d2-aca9-e3f413746b91/vusejamebugisiwuzebewenon.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/cheam_park_farm_school_uniform.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ace3499-4d2c-424a-b5a8-15508a6e049b/6641648809.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_off0000f216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF216 5024 bytes
SHA-256: 06ef84e875a9e9cf57666cfd3eedd14c315058db55b13a8e4455651a06891003
font_01_sfnt_off00010337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10337 10344 bytes
SHA-256: c2126fc1f2d1182cf7fe3574634903df2a9b7365e4d3c9c275ad478d413b864a

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