Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b5c5c521e59a14b…

MALICIOUS

PDF

104.0 KB Created: 2021-03-31 07:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d57a8552ed59993f4db952bcd0582e78 SHA-1: 9bfbbf12abcc62815705a9f748fbc528ab8e8b0a SHA-256: 8b5c5c521e59a14b2a7d6b6ba60f03e435894ee4a94a189e77f221d15bac56e9
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 0.9996

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://golowaki.ru/strik?utm_term=how+to+cut+cow+bones PDF link annotation
    • http://bubiwikozexamo.iblogger.org/pioneer_vsx-821_arc_setup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469638/normal_602f2daaccaef.pdfIn PDF document text
    • https://mesowusiwa.weebly.com/uploads/1/3/5/9/135975120/516bff705f8f.pdfIn PDF document text
    • https://zuwejuropuri.weebly.com/uploads/1/3/1/6/131606208/0603c8b49da701e.pdfIn PDF document text
    • http://sifimomikev.sportsontheweb.net/sepetarodubupuvi.pdfIn PDF document text
    • https://lirobepofuneve.weebly.com/uploads/1/3/0/7/130740173/xesomopitekexo.pdfIn PDF document text
    • http://jijoxep.getenjoyment.net/arthashastra_in_urdu_free_download.pdfIn PDF document text
    • http://savekawiki.iblogger.org/future_scope_of_artificial_intelligence.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/tonuvimexovuxurabovo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495985/normal_605d6abbbdf84.pdfIn PDF document text
    • https://dizarikovir.weebly.com/uploads/1/3/4/6/134627165/4403ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369304/normal_60585817c9b60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444630/normal_6049069d7ee5f.pdfIn PDF document text
    • https://xupulepil.weebly.com/uploads/1/3/4/3/134322414/bebud-lerud-pakala.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/8548551f-25c6-4c07-acc6-eacb558bf3c1/inheritance_cycle_book_4_audiobook.pdfIn PDF document text
    • http://nulidofa.rf.gd/introduction_to_biostatistics_questions_and_answers.pdfIn PDF document text
    • http://bowetuxamu.rf.gd/mathematics_education_research_topics.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/easy_keyboard_chords_for_christian_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1ecfb50-5846-4ca8-855d-72f82d4bdeba/is_there_a_groupme_app_for_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05ab4ff8-8904-432f-98a8-61e3dd69381e/mafolejikonun.pdfIn PDF document text
    • http://timerojulawu.myartsonline.com/29263380523.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/noxapaxesefo.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015e49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E49 4648 bytes
SHA-256: 0c21792317dbffe7ac2d810faf965c8bf92537a7b96b1d4c0009deb6f7f7c425
font_01_sfnt_off00016e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E40 10796 bytes
SHA-256: d3b83f00bf2f2e0ae39d4f14d262c85732830c5a6a615b1776f5df092ee362ab

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