Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac3601240c35d1da…

MALICIOUS

PDF

76.1 KB Created: 2021-03-31 01:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 200e10912a8dcead7ed0618219b870d7 SHA-1: e8e86e46f4db61c824c1ef5734d2cbec66361435 SHA-256: ac3601240c35d1dadd091fdc3c251d679b6d98c0b08037600460b2bf2c79514d
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one specifically disguised as an 'ECG report abnormal values' to entice users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple disposable domains and link farm characteristics further supports a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/123?utm_term=ecg+report+abnormal+values PDF link annotation
    • https://cdn.sqhk.co/kupuruvew/e1mttib/muzusokenelawadifuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480880/normal_602103aa1eafc.pdfIn PDF document text
    • http://pressit.space/quadratic_equation_solving_using_quadratic_formula19n9n.pdfIn PDF document text
    • http://lefibipefazefep.mypressonline.com/how_to_catalogue_a_coin_collection.pdfIn PDF document text
    • http://labifovejes.mypressonline.com/nugapegasu.pdfIn PDF document text
    • http://tesocoin.online/55770023893s0d09.pdfIn PDF document text
    • https://cdn.sqhk.co/gutinisiv/fhdidRX/96872110717.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/fghjcTd/monkey_grass_type_pokemon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453108/normal_5ffd1b70da322.pdfIn PDF document text
    • https://cdn.sqhk.co/moviferu/9jhIKA5/banco_bradesco_numero_pra_ted.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420766/normal_5fd77c06f1e1a.pdfIn PDF document text
    • http://pornbustyvids.com/what_is_the_humidity_outside_right_nowupr5v.pdfIn PDF document text
    • https://cdn.sqhk.co/zanivuwiduvo/jdtt5tL/27855331295.pdfIn PDF document text
    • http://tawaguf.scienceontheweb.net/what_is_hindi_meaning_of_inorganic_chemistry.pdfIn PDF document text
    • http://xodaxedepapopox.mygamesonline.org/early_adulthood_definition.pdfIn PDF document text
    • http://help-nanny.site/510091844932oqtk.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/nopomewegobij/fexemetapijawor.pdfIn PDF document text
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_a806599d15d14b0aa01a280a19db45a4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lazolu/41215966067.pdfIn PDF document text
    • https://2a403a33-5f6e-4534-96f9-742aa7325afc.filesusr.com/ugd/d2da83_63057a33e8ee45fb989c3c42c7d6d777.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/80677153098.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_off0000ecc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC9 5412 bytes
SHA-256: 0813c138762ec4a7364d9c6eca4eba7f68ef46fcfdea0b57a2a4a2c0a7386dc6
font_01_sfnt_off0000ff25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF25 10592 bytes
SHA-256: 6c2e340d6d36078ef514d46f0c284af017cff085ad7efc210059354d45670daf

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