Malicious PDF — malware analysis report

Static analysis result for SHA-256 11f5215b994b9052…

MALICIOUS

PDF

73.7 KB Created: 2021-02-21 20:21:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 64b3078ad9948487e92a76a503ad5312 SHA-1: 9158646921f7200836c8c0c2c6629cc205b121e5 SHA-256: 11f5215b994b9052f2468453ca53c575f26a492c149851449e7057fa93eb822d
126 Risk Score

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/aws?utm_term=guardian+home+technologies PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486365/normal_6023d406944d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461505/normal_6026aafef24e1.pdfIn PDF document text
    • http://kittyplay.online/histoire_de_sanchi_stupa_vitesseo0rce.pdfIn PDF document text
    • http://helpcreditscore.info/xefaralelojosofid186dn.pdfIn PDF document text
    • http://dompodklyuch.com/bally_space_invaders_pinball_manualbj3qh.pdfIn PDF document text
    • http://fresh-ita.space/maths_worksheets_10_year_oldsczxol.pdfIn PDF document text
    • http://swast-group.website/ballard_score_sheetdokm1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451355/normal_6025309b9770e.pdfIn PDF document text
    • http://daimontimur.org/avg_antivirus_pro_cracked_apk_2018hr92w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445868/normal_5fd68c06b5273.pdfIn PDF document text
    • http://teagreen.space/xasupuxekawofedod6dmiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485296/normal_602396accccf0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pikuvideposem.epizy.com/76147742876.pdfIn PDF document text
    • http://likifodafiduno.epizy.com/paluxaju.pdfIn PDF document text
    • http://rufuregebedus.rf.gd/how_to_set_custom_actionbar_in_android.pdfIn PDF document text
    • http://sulumasofip.epizy.com/mejigupukawezorusep.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_off0000e287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE287 5384 bytes
SHA-256: 56c18e8316d38ee7ffcb99a92de73cf88a75b2a48f6bc5055dab45e6e5757065
font_01_sfnt_off0000f4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AB 10856 bytes
SHA-256: b6e9dbbca852f2719fb3b5ce46495f40961f30be43620e1325c0515bae2596e4