Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e0555f1c3cc3dc4…

MALICIOUS

PDF

77.1 KB Created: 2021-02-23 00:16:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5d328ec2a9896ee3eb237f5a530e7df6 SHA-1: 222375d455e775da15d71c64384980ae24c25717 SHA-256: 2e0555f1c3cc3dc451c03c498dcffcb627007ff69341034bf917a6abf7cb12f4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. These links point to various PDF documents hosted on different domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the sheer volume of outbound links is suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/wix?keyword=sea+shack+new+smyrna+beach PDF link annotation
    • http://contentmedialiteracy.com/burger_king_family_bundle_coupon_code_2020rnpnl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411512/normal_60311c5262ece.pdfIn PDF document text
    • https://kofulunaj.weebly.com/uploads/1/3/5/3/135320514/fiwuvunusafez.pdfIn PDF document text
    • https://cdn.sqhk.co/lizupasepafu/jcogd2J/wedding_salon_2_libii_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468831/normal_600e6a2bd8fb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417808/normal_60274dbd1b5b8.pdfIn PDF document text
    • http://shop50off.info/project_makeover_game_cheatsn4hnj.pdfIn PDF document text
    • https://cdn.sqhk.co/mapetidul/yjbu0V9/hmrc_tax_calculator_self_assessment.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489061/normal_602d24e034ce3.pdfIn PDF document text
    • https://tajuzoliv.weebly.com/uploads/1/3/4/3/134359899/8411583.pdfIn PDF document text
    • https://cdn.sqhk.co/zagekexeroze/BNiaCDF/saditawe.pdfIn PDF document text
    • https://kewekekonuv.weebly.com/uploads/1/3/4/7/134732265/powewewevomoj.pdfIn PDF document text
    • https://timifuxi.weebly.com/uploads/1/3/4/6/134676324/novize.pdfIn PDF document text
    • https://cdn.sqhk.co/gozawelesutu/cejjbja/cw_the_100_season_7_release_date.pdfIn PDF document text
    • https://cdn.sqhk.co/guzoladip/NicgjSW/modoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421366/normal_6029df8bd48cd.pdfIn PDF document text
    • http://vvinorama.fun/sahih_al_bukhari_arabic_free_downloadu1vzp.pdfIn PDF document text
    • https://sifobidegi.weebly.com/uploads/1/3/0/8/130874382/89ebd37a2.pdfIn PDF document text
    • https://logifuvixejexa.weebly.com/uploads/1/3/6/0/136019385/rukidulurab.pdfIn PDF document text
    • http://eurostore.info/bootstrap_form_login_registergztng.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B5 5508 bytes
SHA-256: 8f966a9d02c018ab052aa439d8ca2738f941b2caabaa786892820926d9b134c1
font_01_sfnt_off0000fa56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA56 14336 bytes
SHA-256: 36639b0df1672ff84426a0380038f08e530471faa374513800996986f8d24ff2

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