Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55ee871e0417d95…

MALICIOUS

PDF

72.5 KB Created: 2021-03-06 05:18:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 381f9e5d98ba0f72499bfc807a8d97e4 SHA-1: 54a795b3015649415436fcba8886b74d8e9e9744 SHA-256: c55ee871e0417d95ee1ce665a662f0424c65ae57aaa8342ec223946c06a09745
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 0.9998

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
  • 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://jottigo.ru/wix?keyword=buscando+a+alaska+pdf PDF link annotation
    • https://cdn.sqhk.co/bogovureg/dXyYRfz/bowling_balls_size_10.pdfIn PDF document text
    • https://mewarikubunaku.weebly.com/uploads/1/3/1/6/131637951/nubodawesa.pdfIn PDF document text
    • http://miwasigal.mywebcommunity.org/online_grammar_exercises_for_college_students.pdfIn PDF document text
    • https://zavisedifigi.weebly.com/uploads/1/3/4/3/134316550/venuzixisiloxo_tedivanun.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/hjrV1Wl/womilemibawetarurabi.pdfIn PDF document text
    • http://fudomux.22web.org/6744483837.pdfIn PDF document text
    • https://cdn.sqhk.co/womilepeba/chiieAV/train_mania_hacked.pdfIn PDF document text
    • http://xijulefabogi.getenjoyment.net/digi_002_drivers_for_logic_pro_x.pdfIn PDF document text
    • https://kodepifaz.weebly.com/uploads/1/3/4/7/134705681/fagadijakorex.pdfIn PDF document text
    • http://rigoditibalun.mywebcommunity.org/69389342154.pdfIn PDF document text
    • http://duzakimur.iblogger.org/does_tracfone_have_a_smart_flip_phone.pdfIn PDF document text
    • https://lafofawevomu.weebly.com/uploads/1/3/4/7/134770087/5892ece.pdfIn PDF document text
    • http://tiwimifozukimu.medianewsonline.com/43421404624.pdfIn PDF document text
    • https://cdn.sqhk.co/jumifokujuje/gjaifgi/vuninezetenum.pdfIn PDF document text
    • https://rigukolanerimi.weebly.com/uploads/1/3/4/5/134519373/wefutixukip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9933bdbc-3e4b-44ac-b614-19a1cced0e16/essential_arabic_vocabulary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/380ae56e-f350-4559-8f53-7237bb577a5c/honda_em5000s_generator_oil_capacity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86784122-e6c3-4f97-bcfc-f490e9cdc527/kirby_vacuum_cleaners_near_me.pdfIn PDF document text
    • http://xirotowukutizu.epizy.com/93273314715.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_off0000df67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF67 5168 bytes
SHA-256: beb80bd836e98b741261a9fa562bd6280b5cb8d0735458c5e8a0f5d6c6e86b10
font_01_sfnt_off0000f118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF118 10436 bytes
SHA-256: 766723a0a2dd0f65bd48ffd4b8534476b14137ffa473310b6a03d4bd5a092712

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