Malicious PDF — malware analysis report

Static analysis result for SHA-256 087ae3761bfcec3e…

MALICIOUS

PDF

74.3 KB Created: 2021-03-30 15:39:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1fa592747646e2ed8ef2f8e5919fe52a SHA-1: c9d5a00ba9d79c83b6ae84e187f92c15a44973b0 SHA-256: 087ae3761bfcec3e80da52bb967049cf7a3d3d17f04462805a9e539889fe4bb8
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains, suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a URL that aligns with the embedded links, reinforcing the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/wix?keyword=gramatica+c+direct+object+pronouns+level+2+answers PDF link annotation
    • http://solent.bar/120385944352pf9d.pdfIn PDF document text
    • http://probkin34.xyz/2175549829hnl1p.pdfIn PDF document text
    • https://cdn.sqhk.co/nokikifabaf/UsAzjf0/afara_e_frig_song_mp4_free.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.website/marshmello_face_reveal_2020zsq5r.pdfIn PDF document text
    • http://webcam-model.online/ferojaqkmkg.pdfIn PDF document text
    • http://biomaniix.website/autodesk_plant_3d_viewere35uy.pdfIn PDF document text
    • https://cdn.sqhk.co/forexajepusa/e67vdMV/amazon_prime_video_roku_canada.pdfIn PDF document text
    • http://vibigalobonewil.iblogger.org/wilovuwubebuxemigadabevog.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/csCjio7/fijajilogaluga.pdfIn PDF document text
    • https://cdn.sqhk.co/nedabuke/crgfBrI/pixedojuzifazaxo.pdfIn PDF document text
    • https://cdn.sqhk.co/rijunawep/wgcMEHu/micon_x1_weather_icon_pack_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wupetutigo/0jijijf/sokarano.pdfIn PDF document text
    • http://negedibomul.sportsontheweb.net/fotululonapuxupidene.pdfIn PDF document text
    • https://cdn.sqhk.co/konajera/V3hddib/bawifeweja.pdfIn PDF document text
    • http://nogurufegu.mygamesonline.org/certificacion_leed_colombia.pdfIn PDF document text
    • https://cdn.sqhk.co/lexelinowe/MlvidZ4/tusowidojadovaxifajovizif.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/jasadavebaga/stylesheet_not_working_qt.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/17222124770.pdfIn PDF document text
    • http://vipojidetag.epizy.com/kixizafilifu.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/73224750283.pdfIn PDF document text
    • http://xobeminal.atwebpages.com/main_branches_of_psychology.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/sodepadorajelejewaxazu.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_off0000e4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F7 5748 bytes
SHA-256: 646fe2d801a25d267a779a318a26c97086e84e2703d3f9ae84ebece7c7e72cb2
font_01_sfnt_off0000f88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88A 10304 bytes
SHA-256: 73a8444198395545a9ea5d151e23b1d9fd2fdc91af02568a1a0fc0e21f8dc235

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