Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc5cb1b4d220e4d1…

MALICIOUS

PDF

74.8 KB Created: 2021-04-26 13:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cbbd84c206134d8321c230567ca791a9 SHA-1: 1940337de373af92c2a6e431219eed8733bd1298 SHA-256: fc5cb1b4d220e4d1d3c8a34c504414bb139d0be4893050f88935c675ea17f4a9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://seumenha.ru/strik?utm_term=congruent+triangles+worksheet+geometry PDF link annotation
    • https://cdn.sqhk.co/zuwiwejagub/hhjicjh/18301684509.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484997/normal_6036138e9f8b4.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/trQVIig/totub.pdfIn PDF document text
    • http://getchambre.xyz/conscious_discipline_book6g6e3.pdfIn PDF document text
    • http://limaxinsto.xyz/29652522954fcyvd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459337/normal_600bca6a1a0c0.pdfIn PDF document text
    • http://gomijojupi.iblogger.org/kufasosivuzuzidan.pdfIn PDF document text
    • http://gakarefutejet.iblogger.org/art_centre_full_form.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/RjauYiq/rush_limbaugh_health_update_august_24_2020.pdfIn PDF document text
    • http://nukicew.xyz/65557191278q4zbf.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutorixo/KWhibEE/blue_bot_app_windows.pdfIn PDF document text
    • https://cdn.sqhk.co/menasimax/ZjcUhbD/god_of_lightning_norse.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446038/normal_5ffa770d16293.pdfIn PDF document text
    • http://hookup756.fun/nedupemo28rxl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445130/normal_603d3d7caf5cd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kexeban.rf.gd/7458294920.pdfIn PDF document text
    • http://dofurorumilu.epizy.com/new_malayalam_audio_songs_free.pdfIn PDF document text
    • http://javatinidalur.epizy.com/cardiac_tamponade_management.pdfIn PDF document text
    • http://nuzekifigusibu.rf.gd/emotional_intelligence_test_for_students.pdfIn PDF document text
    • http://zumumajubim.epizy.com/fibras_textiles_sinteticas.pdfIn PDF document text
    • http://pexirofovuj.rf.gd/will_colleges_reopen_in_summer_2021.pdfIn PDF document text
    • http://parimafilifupev.rf.gd/schindler_list_piano_sheet.pdfIn PDF document text
    • http://bazokupakem.epizy.com/how_long_does_it_take_to_count_to_20_000.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_off0000e4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C2 5260 bytes
SHA-256: e30a0fab794dc0e063ed2308df7424cc0b469063df05837b5b81e357447d301a
font_01_sfnt_off0000f693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF693 10924 bytes
SHA-256: 1f8a939a78e8467874f377061e4f35c701f8b4a23409e92b492c7355b892f97c

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