Malicious PDF — malware analysis report

Static analysis result for SHA-256 866cc43c771c359b…

MALICIOUS

PDF

76.4 KB Created: 2021-03-01 17:48:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 20c7d915662aceb91e51910b2edca7c3 SHA-1: 5658c917f06aae7fe945ff53adfa7d140db87521 SHA-256: 866cc43c771c359bd571b64b78f8e40ba1c0bfb01bd4f894d8bda425cd4d73b5
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, one of which is associated with a phishing lure related to car maintenance. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and a link farm heuristic further supports a phishing or malicious redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/award?keyword=2009+honda+civic+maintenance+code+a13 PDF link annotation
    • http://spencermcman.us/download_song_aye_mere_humsafar_ek_z83ee8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501057/normal_5ff08bde77d3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499299/normal_5fe4dc9b6eda6.pdfIn PDF document text
    • https://jatitebomotopoz.weebly.com/uploads/1/3/0/7/130776336/xotegemijam-tusixunelisexup-josog.pdfIn PDF document text
    • https://xomitemekebok.weebly.com/uploads/1/3/4/8/134881854/411ee3b5e1f8ec.pdfIn PDF document text
    • http://googsnat.space/types_of_wood_joints_ppt2v1k5.pdfIn PDF document text
    • http://mukinumatonewo.getenjoyment.net/buddhas_brain_chapter_summary.pdfIn PDF document text
    • http://koxelovanalimu.getenjoyment.net/how_do_i_find_the_capacity_of_my_kenmore_washer.pdfIn PDF document text
    • http://nexofozupugasi.mywebcommunity.org/xabezegamadulurunix.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://mukanebesiva.atwebpages.com/69379030132.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/christmas_images_clip_art_free.pdfIn PDF document text
    • http://pefimubis.myartsonline.com/hitchhikers_guide_to_the_galaxy_movie_watch_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tafogusegabomu/what_does_a_blood_gas_test_tell_you.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/17534497910.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_off0000e19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19F 5272 bytes
SHA-256: f69f8ccf0db9e0db58540e04ba6140745eba3bffd5d9f1caed51331dce332e39
font_01_sfnt_off0000f35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35E 10220 bytes
SHA-256: 0c1669afa367d2a062ad2950ff9e83d352591f2dabf8c690d417ec5acb23b90c
font_02_sfnt_off00011653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11653 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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