Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd5953fbf55f1aa…

MALICIOUS

PDF

78.1 KB Created: 2021-03-23 03:30:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 51c4f95ba3289ba37387330380a65d99 SHA-1: 964ed35665c1e704a3747763e6a69e225b128f9e SHA-256: efd5953fbf55f1aa1e1dda0fbc9f19a7b9e11a3170746349f323a5abdec96ba0
166 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 detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The PDF contains invisible links that redirect to a CAPTCHA-themed PDF, likely intended to deceive users into believing they need to complete a verification step. The presence of multiple disposable hosting domains and UTM parameters suggests a campaign focused on traffic generation or credential harvesting.

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
  • Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE
    PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
  • 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://lozipotod.ru/123?utm_term=uppababy+vista+bassinet+sheets PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450438/normal_601d01ce65667.pdfIn PDF document text
    • http://zefakelilivaxo.iblogger.org/captcha_ka_full_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461207/normal_604dc54b60615.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385202/normal_604d3d392bee7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477156/normal_604ce505ced3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465015/normal_5fe8e3acb23c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448995/normal_604c9693d4323.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487399/normal_5fd150aab243f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386091/normal_5fd7abb602a82.pdfIn PDF document text
    • http://pepujolajerikur.66ghz.com/2208981962.pdfIn PDF document text
    • http://nuweselomarovir.22web.org/pesexazaxeladinugekib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375075/normal_603513c2390a0.pdfIn PDF document text
    • http://kosadezisadin.22web.org/mepuwenur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ketened.rf.gd/filemenojigowuf.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/free_to_air_tv_guide_sydney_printable.pdfIn PDF document text
    • http://kuletenifilel.rf.gd/wanna_break_night_meaning.pdfIn PDF document text
    • http://laneneloko.epizy.com/6911785283.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/what_is_the_meaning_of_anaphora_in_literary_devices.pdfIn PDF document text
    • http://janilemexe.epizy.com/numbers_worksheets_11_20.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_off0000f3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DF 5072 bytes
SHA-256: e5c079fcdaf82210caa30b3845ea4fb361e004ccb7f087b3a98b85f9fbef4589
font_01_sfnt_off00010526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10526 11320 bytes
SHA-256: 9c829b67ec29d549fd0e5b7f43959549e558aa2b4376cf59ab3fafe1b7d1cac5

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