Malicious PDF — malware analysis report

Static analysis result for SHA-256 40f9529cd255215b…

MALICIOUS

PDF

76.1 KB Created: 2021-03-14 13:35:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 85855517aec5aaa497771fe5bba756e6 SHA-1: f823e7570fcb3384065adc5d4584371595ed8a17 SHA-256: 40f9529cd255215ba6d71edb9efb5649d4b284be93621d70ca69dab67cdeeb04
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URI pointing to a suspicious domain, which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to 'division pteridophyta'. No scripts were extracted, but the PDF structure itself facilitated the embedding of the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=division+pteridophyta+pdf PDF link annotation
    • https://posilopawirina.weebly.com/uploads/1/3/4/3/134353572/dijipo-dinodadif.pdfIn PDF document text
    • http://xogiraj.iblogger.org/kenajuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474739/normal_600e4108457c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389101/normal_5fd79dd672182.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387577/normal_6023ec89243e1.pdfIn PDF document text
    • https://luwanolukurodo.weebly.com/uploads/1/3/5/3/135397368/c02d045b2d8fbc.pdfIn PDF document text
    • https://subarijarasojud.weebly.com/uploads/1/3/4/3/134332778/sejonosuziworo_giliru.pdfIn PDF document text
    • http://tizakeguwowil.22web.org/tebizuxarapubi.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/mejigavukolu/dewalt_pressure_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d96801ea-011a-4a59-9af0-1841a8b39e2b/gout_cookbook.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/32173484980.pdfIn PDF document text
    • http://witawediwi.epizy.com/bangla_book_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2689f0b7-a84d-4f02-9415-e28161140be8/dirt_devil_spot_scrubber_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1af3b77f-1bc8-4774-85bf-814341017255/30_para_surahs_names.pdfIn PDF document text
    • http://jufomotapi.epizy.com/novikogopol.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/kitni_bar_full_song.pdfIn PDF document text
    • http://sufiwufefolama.rf.gd/any_video_converter_full_version_utorrent.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/46265688338.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55dd33c8-8b0c-48c6-8754-9d277aed7eec/canon_vixia_hf_r82_live_streaming.pdfIn PDF document text
    • http://lujatasatepixop.rf.gd/zawitet.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/the_open_window_question_answers.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_off0000eebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBE 5256 bytes
SHA-256: 924b4aab7884c261037faed39fd80552782e13e53c6f08ae0741b1ab0ff54482
font_01_sfnt_off000100b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B2 10116 bytes
SHA-256: 28880998367f1bad172a08e5e84c4b2e0e66568d201b6d9fbe7929a8c79484a2

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