Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b1b434c9a7d282…

MALICIOUS

PDF

81.6 KB Created: 2021-04-24 15:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6a64e0d527a323fd6e192a5c8f357bc5 SHA-1: 8ed6f6fef0b8d0a4ac73943bf4a1974cc4e972cd SHA-256: d8b1b434c9a7d282189cbffc5904b0f88052040c7bb7670bb68e321638b11d93
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://mezovuduw.ru/strik?utm_term=dbx+driverack+4800 PDF link annotation
    • https://cdn.sqhk.co/labifikup/gczIA8G/gitopodarolifefi.pdfIn PDF document text
    • https://nafoxowozuvika.weebly.com/uploads/1/3/1/3/131383754/xajomokedipijor-midimevodimak-bepivipobibami.pdfIn PDF document text
    • https://cdn.sqhk.co/nonatedogo/dDSia7R/the_banner_saga_3_walkthrough.pdfIn PDF document text
    • https://cdn.sqhk.co/talexadu/ia4Wyhi/home_health_care_incident_report_form.pdfIn PDF document text
    • https://cdn.sqhk.co/sirijunubi/iahgvid/fat_gumball_gamer.pdfIn PDF document text
    • https://gejidodedawo.weebly.com/uploads/1/3/4/0/134018108/6644464.pdfIn PDF document text
    • https://cdn.sqhk.co/joxomawezu/jaifguM/online_video_audio_converter_free.pdfIn PDF document text
    • https://cdn.sqhk.co/bilanogakiw/fWhdjfs/22512452401.pdfIn PDF document text
    • https://cdn.sqhk.co/woviwefi/QjbRge1/beard_trimming_guide_tool.pdfIn PDF document text
    • https://tivulose.weebly.com/uploads/1/3/4/3/134318041/38af2d05a908.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/DmxhGji/94646673495.pdfIn PDF document text
    • https://cdn.sqhk.co/xidizizo/PicZJX8/pufuladiwewupowolor.pdfIn PDF document text
    • https://cdn.sqhk.co/jagakutojut/0DjageC/2870667175.pdfIn PDF document text
    • https://cdn.sqhk.co/xoraxuvonaf/p3ic54P/88651020914.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvapolaxaj/cmZhhjc/axes_io_oyna_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/dhbpcZL/vixexesudifaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dc010c70-835d-4b56-8cb0-1e1bda7cab64.filesusr.com/ugd/fb576b_e69b3f4d696d4cc99c4988ccfc0cfb4c.pdf?index=trueIn PDF document text
    • http://xitunixanamo.epizy.com/avg_internet_security_2018_free_softonic.pdfIn PDF document text
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_9d5118158e7140d8993a1d4f13200a18.pdf?index=trueIn PDF document text
    • http://tebexuvizo.rf.gd/how_much_do_nordic_hot_tubs_cost.pdfIn PDF document text
    • http://pukupufiribeja.epizy.com/big_bus_abu_dhabi_map.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_off0000ecc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC6 5232 bytes
SHA-256: dc3f3763ab29e4450838586d9d5438376ed6a5c96e98e66ca988e249f2b48018
font_01_sfnt_off0000feed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEED 5476 bytes
SHA-256: 88fd69705e5a85cfb2e162e409e1d2e63e35771faa5d519f2d9cec7c821414b0
font_02_sfnt_off000111af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AF 11616 bytes
SHA-256: c7092a56ba11ad7ddf4f9b0915eb79f0852e3566169aace39f3bf05abe094522

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