Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e26128e486f11d5…

MALICIOUS

PDF

68.5 KB Created: 2021-01-31 19:41:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 541129ed2e6fdf2de323245f5316865e SHA-1: 0ecef068a6410b0cbecb6cf6403249c8de9328f8 SHA-256: 3e26128e486f11d5f801e4c9359a3023ca01e1edc959ebc0a753289e4b0fe12c
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple embedded URLs, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The file's structure and embedded links suggest it's part of a campaign to lure users to external malicious sites.

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=karyotype+e+worksheet+answer+key In PDF document text
    • https://static.s123-cdn-static.com/uploads/4474462/normal_5fcf09b7ea673.pdfIn PDF document text
    • https://cdn.sqhk.co/damukowabij/fvhbgcP/neurologist_meaning_in_tamil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460966/normal_5ff5c175c6a6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372960/normal_6016e8c344a6e.pdfIn PDF document text
    • https://cdn.sqhk.co/sirojenu/Djd4t1g/zombie_castaways_pirate_island_map.pdfIn PDF document text
    • http://jikawixekeras.iblogger.org/bullet_train_game.pdfIn PDF document text
    • https://cdn.sqhk.co/ropobemuma/mQCLnhb/pupud.pdfIn PDF document text
    • https://vodesaladamaju.weebly.com/uploads/1/3/5/2/135298616/domuxas-faleli-zaxefebetomari.pdfIn PDF document text
    • https://rinixupikexem.weebly.com/uploads/1/3/4/0/134096042/5fc18.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368736/normal_6002a75b704c8.pdfIn PDF document text
    • https://cdn.sqhk.co/metexemoraga/4t2bTgd/ice_cream_maker_machine_near_me.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://notijopozij.epizy.com/galloping_foxley_roald_dahl.pdfIn PDF document text
    • http://zunimesigo.rf.gd/professional_ppt_templates_free_2017.pdfIn PDF document text
    • http://felubumasosazi.epizy.com/51488875411.pdfIn PDF document text
    • http://tokofelutuj.epizy.com/39623539827.pdfIn PDF document text
    • http://vobuxex.epizy.com/chantix_prescribing_information.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_off0000cffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFD 5104 bytes
SHA-256: 7114d5d94989bd9c9f58a0715937ec06be13fe5cda2a0d13b01d02111bfd97bd
font_01_sfnt_off0000e16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16C 10508 bytes
SHA-256: 514587b18a512abf5bcb1ef9eb9183ee5213b4d59b2304b40ea3cef365b6a0f8

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