Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b561029151fe90…

MALICIOUS

PDF

75.6 KB Created: 2021-03-20 05:43:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 353736a524fe48ff3903826bab888d11 SHA-1: ed14e0d77ec0b629c63e699c5251a075d8cad659 SHA-256: 53b561029151fe9059091446fcf9fc144c3e548861354caf9ed9be42cdb83e6e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to 'golowaki.ru'. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classifying it as a phishing trojan. The presence of embedded URLs and the structure suggest an attempt to direct users to potentially malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • 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://golowaki.ru/wix?keyword=physics+reu+summer+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393790/normal_605378cd0b3f4.pdfIn PDF document text
    • http://bettermoneytips.com/what_does_sit_a_spell_meanub13t.pdfIn PDF document text
    • http://igoscandinavia.com/2007_chevy_impala_transmission_fluid_checkod2s3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403130/normal_5fe84ed6b5a14.pdfIn PDF document text
    • http://keepxufi.space/atlas_activated_suspension_headrest_for_herman_miller_aeron_chairvuyhy.pdfIn PDF document text
    • http://italywow.pro/filmywap_bollywood_movies_2018_freefflwr.pdfIn PDF document text
    • http://trellos.fun/how_big_is_a_32_bit_int8elvv.pdfIn PDF document text
    • http://jobauthor.online/askep_alkalosis_respiratorikw6pe1.pdfIn PDF document text
    • http://x-bionic.shop/78028032571nbaoq.pdfIn PDF document text
    • http://hellochildren.online/wopugusiafaz7.pdfIn PDF document text
    • http://hookup154.site/xerifesizujidogebafuziligwj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449769/normal_5fc71c6f05a8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410000/normal_60246386aac3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402720/normal_5fc88c066366d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/gangster_games_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/nuvugowisofufukex.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/baby_love_couple_images.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/53352994632.pdfIn PDF document text
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_1e21573f5b224720ac2835c7ebed3f13.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/vetalasolemobuvuzedag.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/sukezagoliwotiwapebata.pdfIn PDF document text
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_af2a088befc74aa8a5eb47e0535052fb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/remstar_auto_a-flex_m_series.pdfIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_897a048ad4ad46778f76b51f7d5ba551.pdf?index=trueIn 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_off0000ec2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2C 5176 bytes
SHA-256: 2870123fde337ed09971b8233a9b310a8785eba4c0dc8e17c732072bb47dc21d
font_01_sfnt_off0000fda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA8 10372 bytes
SHA-256: 84a08643aa359a43464880b162bd9101173149c9ada1244a96f70bf1f4d5398d

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