Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcc0f82e802279e2…

MALICIOUS

PDF

84.3 KB Created: 2021-02-13 10:39:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 05cb0ddd363b5a17261c2453b215b22e SHA-1: eacac95094101cf24ee1d7a5f833524f9e5a82a9 SHA-256: bcc0f82e802279e25701107183450dcdb2d66193ad2bca1a47bb0ce98e0ef0f8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://crophysi.ru/123?utm_term=linear+algebra+done+right+springer+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379498/normal_5fd0b830f0c7c.pdfIn PDF document text
    • https://cdn.sqhk.co/xakatikakizi/hjhkjjg/gawunok.pdfIn PDF document text
    • https://xunopigiwigon.weebly.com/uploads/1/3/1/6/131636761/lapekoli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384828/normal_601fee14b53b0.pdfIn PDF document text
    • https://migobajiker.weebly.com/uploads/1/3/5/3/135390735/435e4ba5208744.pdfIn PDF document text
    • http://parralax.net/norton_antivirus_for_windows_7_pcvtek0.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/hehdhj9/transfer_station_dump_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/mopomotop/igJJTic/spinal_tap_11_gif.pdfIn PDF document text
    • https://cdn.sqhk.co/tatogevi/naifdig/national_geographic_kids_bats.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418557/normal_5ff42f3f5f000.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wometopususap.rf.gd/audition_ph_full_installer_2017.pdfIn PDF document text
    • http://zazuxevepiz.rf.gd/fojujametuvezukekiwa.pdfIn PDF document text
    • http://pirafabitibabik.rf.gd/alan_walker_song_on_my_way.pdfIn PDF document text
    • http://bikufupok.rf.gd/adjectives_of_personality_flashcards.pdfIn PDF document text
    • http://jabisuluro.epizy.com/coca_cola_swot_analysis_2018.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68F 4016 bytes
SHA-256: b18b129da02dd43e310f1315717628b9b3b55bdaecddd01f899ed48c2a440576
font_01_sfnt_off0000f4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BE 5384 bytes
SHA-256: 81861231cbb86eb501b16313bc4e574755797c4aa54032ed72a738ac8fd2040a
font_02_sfnt_off000106ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FF 11176 bytes
SHA-256: 1bf76661b4ba180dd42132f1e075bf5124657c023466aaac1259f0f1324e6fcb
font_03_sfnt_off00012ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE5 16348 bytes
SHA-256: e3429d48874a3d00b1f8cb9d707a23dca1d8d95f3bd03a68068622fbfe567578

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