Malicious PDF — malware analysis report

Static analysis result for SHA-256 11fc4d39155deee3…

MALICIOUS

PDF

73.7 KB Created: 2021-04-18 06:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fd349169419d9e70a92dc809b3d4950f SHA-1: 571b8bfa41c9bdc097bb91d1521cf3ef72624a70 SHA-256: 11fc4d39155deee3e35aba76a3dcc6b3da041a349acf92f5185204b36824264d
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://jacksth.ru/strik?utm_term=triton+atm+error+code+119 PDF link annotation
    • http://fb-copyright-help-from.com/87195148792iwwsq.pdfIn PDF document text
    • http://burrrhey.tech/it_should_be_fine_synonymwehln.pdfIn PDF document text
    • https://cdn.sqhk.co/jabisopomuxo/8khcgjc/vazozotulazenakopulatuje.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420939/normal_5ff05c129a968.pdfIn PDF document text
    • http://kazotapojiwi.mywebcommunity.org/80526127089.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402478/normal_5fff46e53b7a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409246/normal_6015bc26d1de6.pdfIn PDF document text
    • https://cdn.sqhk.co/mareduviger/cilgJR7/vapizep.pdfIn PDF document text
    • http://wisecredit.info/fobamru93n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421764/normal_6061e9321f6b6.pdfIn PDF document text
    • http://salleapp.xyz/vewofefevuuvpjf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479435/normal_604d0756b8c08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494889/normal_604f59206bd43.pdfIn PDF document text
    • http://bit7.top/diagrama_de_fases_agua_purapht8b.pdfIn PDF document text
    • http://jojidasusesot.sportsontheweb.net/53476698341.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/375aec86-7388-4e71-b85d-e953a47593df/82877766157.pdfIn PDF document text
    • http://tifilow.onlinewebshop.net/is_kindle_touch_still_supported.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bb43e65-f9cf-4988-8f46-28cc0cce3a6e/i_am_zlatan_who_the_hell_are_you.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3772777-8387-4b71-89e0-25ba5834ec3e/wanabanag.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_off0000e6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BC 5032 bytes
SHA-256: b45afe1693c721d1dcaff7655301f0aa7ade021da7717eb059d891160f826961
font_01_sfnt_off0000f7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C4 10260 bytes
SHA-256: b285cd6b9f31adb75b6b94419e9832ee31b858c6edea9495a1dbe11dcd1d39f3

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