Malicious PDF — malware analysis report

Static analysis result for SHA-256 762ff90b73898799…

MALICIOUS

PDF

74.0 KB Created: 2021-01-22 06:29:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d4c3cda4c0fb50a12503f7e9e27f7e39 SHA-1: ee7fb642d1e058e9f6ab92542eab33e05d8cf917 SHA-256: 762ff90b738987990ec392b2b10115691fae05339a87dc4861dd583f6100fe68
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains metadata related to 'Picket fence quilt pattern' and the authoring application 'wkhtmltopdf', which is likely a lure to disguise the malicious intent of directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffset.ru/123?utm_term=picket+fence+quilt+pattern PDF link annotation
    • https://kinojapi.weebly.com/uploads/1/3/2/3/132302846/mudekipapu-lupeje.pdfIn PDF document text
    • https://site-1166051.mozfiles.com/files/1166051/zara_black_friday_sale_2020_south_africa.pdfIn PDF document text
    • https://site-1234924.mozfiles.com/files/1234924/wwe_wrestlemania_bleacher_report.pdfIn PDF document text
    • https://site-1242757.mozfiles.com/files/1242757/sawevimiwixumibosut.pdfIn PDF document text
    • http://wopebexe.66ghz.com/fauquier_county_sheriff_report.pdfIn PDF document text
    • https://site-1178567.mozfiles.com/files/1178567/xakepifuravefe.pdfIn PDF document text
    • http://zimefob.22web.org/49628666067.pdfIn PDF document text
    • https://jigotofobab.weebly.com/uploads/1/3/5/3/135300724/koxulejo.pdfIn PDF document text
    • https://site-1200561.mozfiles.com/files/1200561/rock_en_espanol_radio_online_mexico.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gugujis.epizy.com/69686073559.pdfIn PDF document text
    • http://zewogukanonudut.epizy.com/rpg_maker_vx_games.pdfIn PDF document text
    • http://xivefasojag.epizy.com/google_sheets_python_module.pdfIn PDF document text
    • http://dewelimu.epizy.com/anatomy_of_human_teeth.pdfIn PDF document text
    • http://dewudirana.epizy.com/parisian_clothing_size_guide.pdfIn PDF document text
    • http://bilunijo.epizy.com/dixezokekipowejoxeduz.pdfIn PDF document text
    • http://satekivu.rf.gd/98070061296.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D8 4796 bytes
SHA-256: 4ef63a8acfc0e22c1d7099a422b32e79875fc898e10e85e25ad60e8445350416
font_01_sfnt_off0000e82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82B 10764 bytes
SHA-256: a2c27eecd4c5c2d197dcf52c34b4a9396d40c72ac3013ea0dc6159161ce83942
font_02_sfnt_off00010c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C82 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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