Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1bacab831030f11…

MALICIOUS

PDF

75.4 KB Created: 2021-03-02 03:49:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ea84758860b743d3a996d0d7f922753d SHA-1: ec8288b649fbd67bcde732840588c5681e35146c SHA-256: a1bacab831030f111686a8d97ad007d8a12e8746fc81f28be5439becd85c9442
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://lozipotod.ru/strik?utm_term=how+to+write+morning+pages PDF link annotation
    • http://smilex.club/88694171280smczc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446921/normal_5fe65f4959d74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388156/normal_60072496b02cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420468/normal_602dfdc3de72a.pdfIn PDF document text
    • http://cadenalia.com/graphing_linear_equations_worksheet_and_answers6f2ca.pdfIn PDF document text
    • http://tuzogat.sportsontheweb.net/what_does_the_name_tanya_mean_in_indian.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417408/normal_6021545d0b05d.pdfIn PDF document text
    • https://cdn.sqhk.co/sepetoxofaw/ighhaie/minecraft_build_battle_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/wefekoferu/ggjeic2/96763738671.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379374/normal_6003da261fb6d.pdfIn PDF document text
    • http://sufulilutidake.mypressonline.com/mifadu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nopizapokife.epizy.com/sharabi_amitabh_bachchan_song.pdfIn PDF document text
    • http://gevewodex.epizy.com/why_we_use_chloroform_in_dna_extraction.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/73971561183.pdfIn PDF document text
    • http://gozenabuzixi.onlinewebshop.net/pojoxonefofanojodez.pdfIn PDF document text
    • http://xekababemaxukop.rf.gd/definition_of_yield_management.pdfIn PDF document text
    • https://s3.amazonaws.com/juvosi/asurion_verizon_affidavit_form.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/the_apostolic_church_hymn_book.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/423844766.pdfIn PDF document text
    • http://disofebuwugojuj.epizy.com/alcatel_one_touch_4015d_firmware.pdfIn PDF document text
    • http://zowofiz.myartsonline.com/15554318198.pdfIn PDF document text
    • http://sagalesokalu.epizy.com/dekaron_rising_ak_guide.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_off0000eb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0B 5160 bytes
SHA-256: 84437ea863c0c601383155848a5d3192f5602d38d2b46d7721fdc24179e5f6a2
font_01_sfnt_off0000fc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC91 10508 bytes
SHA-256: 03256768cc5ab6685e9acc366f375d5b29150ff034f2e2d45cd628f387a23c04

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