Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b50b01fd1c84898…

MALICIOUS

PDF

81.2 KB Created: 2021-03-22 09:13:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 16b2bf85ec6fad08a1eb02935e89ab25 SHA-1: df808423d165941635f90fda71262d6bef884851 SHA-256: 8b50b01fd1c848982e1b0850dff0ed0240538047c3473122fb4b188ce184c280
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple external URLs, with at least one pointing to a disposable hosting domain and another to a domain associated with link farming. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or redirecting users to malicious content. No scripts were extracted, but the presence of numerous URLs suggests an attempt to direct the user to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://fokemale.ru/123?utm_term=chlorhydrate+de+metformine+vidal PDF link annotation
    • http://miwasigal.mywebcommunity.org/learn_python_in_one_day_and_learn_it_well_workbook.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406787/normal_602de484c99f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462351/normal_5ff1eb5f4eaea.pdfIn PDF document text
    • http://nepoxiduvilej.scienceontheweb.net/viruvanonukenatezuna.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465397/normal_602258ed1b556.pdfIn PDF document text
    • http://rozujed.sportsontheweb.net/short_story_competitions_december_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462096/normal_5fdbcb5adba21.pdfIn PDF document text
    • http://daludaja.getenjoyment.net/abstract_algebra_with_applications_spindler.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369504/normal_600c7ce73e6bb.pdfIn PDF document text
    • http://janurikemodowu.iblogger.org/94990977922.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wolaniloko.epizy.com/sawuri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37b42189-1636-45fa-9cb0-57bccbb70182/all_my_friends_are_dead_book_reading.pdfIn PDF document text
    • http://nudifezidezi.rf.gd/jardine_crib_instructions.pdfIn PDF document text
    • http://zolibexusago.epizy.com/how_to_become_a_more_creative_photographer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58e7232a-a295-47bd-9b81-33573c835eac/driver_genius_pro_crack_free_download.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_off0000fd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD24 5036 bytes
SHA-256: e2ab80d9aeb103504991c7ca210d45928be3857bf82f0fdb05d2f2556797ddd1
font_01_sfnt_off00010e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E24 12668 bytes
SHA-256: cce8c139a47a8c0617c6608a48da41edcad871cecb5d21bd1c38bb94cdc85f8a

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