Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff78f573bc11b6ac…

MALICIOUS

PDF

77.2 KB Created: 2021-04-18 04:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 833fb31d1beb2c44343a0058f6fbbdd2 SHA-1: 05ef3949e27a6762522dacdac0d22f1d5b03ccf2 SHA-256: ff78f573bc11b6acf2c1f52c7e9289e4ebaee373761744e56b0d308752b0623e
134 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including one hosted on disposable infrastructure, suggests a link farm or phishing lure. The heuristic 'SE_URGENCY_LURE' indicates the document may contain deceptive language to prompt immediate user action, further supporting a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://kuzutuzo.ru/strik?utm_term=roald+dahl+collection+reading+level PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501054/normal_60592d71ee758.pdfIn PDF document text
    • http://vutajazelige.medianewsonline.com/dimixomineligeviwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446924/normal_60391d25b7170.pdfIn PDF document text
    • http://mumijivamivaxij.medianewsonline.com/18648045993.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387421/normal_600bfcd644a17.pdfIn PDF document text
    • http://suzamakulamuj.mypressonline.com/computer_chapter_1_internet_class_10_notes.pdfIn PDF document text
    • http://wutesokafuzirew.iblogger.org/all_about_the_rock_cycle.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nupopagiwagivu.epizy.com/is_tai_chi_tea_good_for_you.pdfIn PDF document text
    • http://dasobiviwadodaj.atwebpages.com/qsc_rmx_2450a_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a7df4b4-9d51-43a0-b46a-b6562d88c195/rajotipotowodinogovati.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/10465630100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29f87895-d3db-4a82-ba2f-41d3999b96f4/hitchhikers_guide_to_the_galaxy_book_sparknotes.pdfIn PDF document text
    • http://zatuvejamubolo.atwebpages.com/bishnu_prasad_rabha.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/admission_form_for_kindergarten_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d03bfa0-d3b7-4875-82ee-e39e6949d4f4/sakimetuzopageduwejes.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/dark_souls_3_save_editor_pc.pdfIn PDF document text
    • http://zobemodorujo.rf.gd/smooth_scrolling_firefox_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fddc980b-50e6-4cae-84e4-5757731b115a/30217007422.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/82741150767.pdfIn PDF document text
    • http://xovolefewawex.atwebpages.com/cambridge_english_first_practice_tests_2020.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_off0000eec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC2 5092 bytes
SHA-256: b16d38fca15fca60364edb07715dd316bdbc3a1b377b2cefb88a5f66601fb81d
font_01_sfnt_off00010016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10016 11820 bytes
SHA-256: 4747cf4c79a3a0a37273fa801c47fae063eb5c635d44cc76cc48105595660f73

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