Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc88c939b65fe327…

MALICIOUS

PDF

68.1 KB Created: 2021-04-13 17:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c18e14e0e490045584c4f4f22c243bfd SHA-1: 4eae7279ff1103f2f5834af8448d9e92f407da86 SHA-256: dc88c939b65fe327288f428d6e70708490a71968698920f002379e08e2bbd47d
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 ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dafemum.ru/strik?utm_term=how+to+use+klein+tools+voltage+tester+et60 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4488582/normal_6024292276fd3.pdfIn PDF document text
    • http://omoikiri.info/skyrim_enchanting_guide_for_magesy0xlv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415768/normal_5ff58f28daea1.pdfIn PDF document text
    • http://leoidet.xyz/dolimilowodegotfdg2.pdfIn PDF document text
    • http://hookup673.site/is_it_free_to_return_package_to_senderw12ny.pdfIn PDF document text
    • http://eslife.pro/zalukuzijoztma6t.pdfIn PDF document text
    • http://katermore.ru/75591774042hddea.pdfIn PDF document text
    • http://kigaruzolalo.mypressonline.com/computer_science_question_and_answers.pdfIn PDF document text
    • http://narovomesizi.medianewsonline.com/76805131436.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497368/normal_6043557bb14f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369487/normal_605e042b0b038.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421780/normal_603c240978677.pdfIn PDF document text
    • http://lewijufe.sportsontheweb.net/oxford_biology_dictionary_download.pdfIn PDF document text
    • http://saudiautoinsurance.com/90092164873p1a88.pdfIn PDF document text
    • http://zozavelomidabi.scienceontheweb.net/auxiliary_verbs_in_english.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b2bd4247-5771-4f9a-9f3f-b46500bff287.filesusr.com/ugd/f41bfe_939a56fe506342a780cbfe15c9e06006.pdf?index=trueIn PDF document text
    • https://c72a6d71-2fad-4f5a-8b7a-a7c165485bce.filesusr.com/ugd/a4966f_65acd3025c784b648e1fa5f8bf17748e.pdf?index=trueIn PDF document text
    • http://pavafisufopu.myartsonline.com/advanced_computer_architecture_lecture_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d78acc2f-07a7-4079-9d98-16abf1338dc3/denon_dn-d4000_manual.pdfIn PDF document text
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_4575996d078142b59a5b7f07bf85b1a7.pdf?index=trueIn PDF document text
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_4fd1d3dda18a484fb7d20a4fab9a9248.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/44725baf-01de-4bbb-897a-267a0cd887ff/99537780596.pdfIn PDF document text
    • https://983c8978-ad56-435f-a988-47358aa6040c.filesusr.com/ugd/06a663_725f1c8def064fdebc81d3b602507a9a.pdf?index=trueIn 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_off0000cc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6B 5328 bytes
SHA-256: 7fbe57300b01164366c326ec20be631a1a0adeb983e9fe9b681f072755ac30b3
font_01_sfnt_off0000deb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB2 10580 bytes
SHA-256: 84a5be3d8a3c47bd08defeaa5c9c743eaa2ba82b692fb4b27bb955bb146ce245