Malicious PDF — malware analysis report

Static analysis result for SHA-256 6544aada6457cf37…

MALICIOUS

PDF

68.1 KB Created: 2020-11-27 05:54:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d9b17d5245f488be13902490893b6960 SHA-1: 906cd0ea77ea89aaeeb2e854c7fd05c63f78feb3 SHA-256: 6544aada6457cf374766499957fd4a088a18fb9f5c2f72e4d31831bfac517d1f
256 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm designed for SEO manipulation. It also presents a fake CAPTCHA, a common tactic to trick users into clicking malicious links. The presence of brand impersonation and a link to a redirector further supports a phishing attack pattern. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://tekegalesi.weebly.com/uploads/1/3/0/7/130740489/5ed314afbc5a7a.pdf.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/strik?utm_term=how+to+retrieve+twitch+account PDF link annotation
    • https://tekegalesi.weebly.com/uploads/1/3/0/7/130740489/5ed314afbc5a7a.pdfIn PDF document text
    • https://jajoteraluwem.weebly.com/uploads/1/3/4/1/134108878/gusin.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/vorisowud_kasaguxuwuruxa_nabep.pdfIn PDF document text
    • https://bewapuvin.weebly.com/uploads/1/3/1/4/131453684/renezojajesume.pdfIn PDF document text
    • https://temoxemotedi.weebly.com/uploads/1/3/4/5/134599163/tupekinigumimik_sixuduriw_zokeb_zafitusekuti.pdfIn PDF document text
    • https://kumusexowefas.weebly.com/uploads/1/3/2/7/132741352/2914322.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/sitozi/32035628413.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1433149d-5a98-4d52-907b-a797bfea8aef/futuzodinuverow.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/low_battery_wallpaper_hd_android.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/landing_page_monkey_coupon_code.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/management_budget_report_for_the_year_2003.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/carbon_nanotubes_properties.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec6d682d-ddbd-4fd4-9ac1-7bd70edaaca9/99801155821.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/69545856197.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/sample_introduction_narrative_report_job_training.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bd92126-88a8-4e79-99c2-ee74c4f4668e/90228678425.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFB 4792 bytes
SHA-256: ceef20af350575d41fa455ad93210e1026c1ff40f9a67711656e17732281d0a6
font_01_sfnt_off0000e055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE055 10300 bytes
SHA-256: b56cfa4fdcef5327f708920306d9a64a101b281464721e72be0c9bb51eaa6328

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