Malicious PDF — malware analysis report

Static analysis result for SHA-256 211c96e8e0686549…

MALICIOUS

PDF

71.4 KB Created: 2021-02-14 16:58:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 77dcdef74d320646779cbf561bee1f46 SHA-1: 894ff73b4b4f95fb24b5f584e27aa4d6c0725800 SHA-256: 211c96e8e068654997b38718c231d1eac4dbf05bfdc7373a75005bb4701156a6
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure related to 'telling time practice worksheets grade 3'. The presence of multiple disposable domains and link farms suggests a phishing or scam campaign. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/aws?utm_term=telling+time+practice+worksheets+grade+3 In PDF document text
    • http://swiss-gear.store/bevobeg7ai5m.pdfIn PDF document text
    • https://wobanavemo.weebly.com/uploads/1/3/4/0/134096337/pupuga-bivutunawozude-soletov-tekefebuzonof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371524/normal_5fd20359ac043.pdfIn PDF document text
    • http://datingdate.site/tower_electric_denver_colorado1l4d7.pdfIn PDF document text
    • http://infonewstravel.com/siren_head_free_gameplay7mh1d.pdfIn PDF document text
    • http://freshremont.com/7051983882060qsw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393209/normal_60129ecbe7dc2.pdfIn PDF document text
    • http://scrlt.xyz/alan_walker_faded_piano_sheet0irbt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498330/normal_5ff42fbcbb04e.pdfIn PDF document text
    • https://tubemugipowiw.weebly.com/uploads/1/3/4/3/134345788/3174255.pdfIn PDF document text
    • https://zuzivosojix.weebly.com/uploads/1/3/0/7/130775151/5054712.pdfIn PDF document text
    • https://sigajijatikad.weebly.com/uploads/1/3/1/3/131379485/mutirapitezopoled.pdfIn PDF document text
    • https://feraresafobigim.weebly.com/uploads/1/3/0/8/130813798/daf60e7572ee68d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416501/normal_601bb80954678.pdfIn PDF document text
    • http://kikovetademu.22web.org/xekokaxuzowaloxunum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuvituze.epizy.com/18691300489.pdfIn PDF document text
    • http://putiremupupunis.epizy.com/airport_airline_tycoon_mod_apk.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_off0000d968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD968 5756 bytes
SHA-256: ec411fb2283ebd2ddf18d50312a1e2edfe610487d502fe237db48396f76117fb
font_01_sfnt_off0000ece5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE5 10352 bytes
SHA-256: 32ad5f38a7fc01f89ffe7aa729424beaf787e2bd34d01e346dfc469d6211d7d6

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