Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f3501a73e1af701…

MALICIOUS

PDF

77.7 KB Created: 2021-03-25 06:41:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f90361124dec4fb42a7855cc6deba1cf SHA-1: b9edddef8da153a73d2afab07aeac06a30de4264 SHA-256: 7f3501a73e1af70119f535cdb5bf408b1a25d712be724eb07c6d3e12d17ba995
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 6

  • 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 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://resalured.ru/123?utm_term=nccn+guidelines+colorectal+cancer+2017+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366639/normal_5fee18703386a.pdfIn PDF document text
    • http://ogranicbio.space/asites_indonesia576u3.pdfIn PDF document text
    • http://soldatskaya6.ru/lajukokagijuvewum6gg2q.pdfIn PDF document text
    • http://winsbig.space/new_viral_my_video_organic_views_generator3iw15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459792/normal_6058e4ad51f4c.pdfIn PDF document text
    • https://vepufekuso.weebly.com/uploads/1/3/0/7/130775624/wetazif.pdfIn PDF document text
    • http://teguruta.medianewsonline.com/doxawomedalubekedizud.pdfIn PDF document text
    • http://merexazumebenag.medianewsonline.com/42715049339.pdfIn PDF document text
    • http://siviveko.getenjoyment.net/xaxif.pdfIn PDF document text
    • http://tibudirowe.mygamesonline.org/zimsec_o_level_biology_notes.pdfIn PDF document text
    • https://dosoludu.weebly.com/uploads/1/3/0/8/130814101/64ef3ad91.pdfIn PDF document text
    • https://momigetufi.weebly.com/uploads/1/3/4/8/134876151/finum.pdfIn PDF document text
    • http://kigurumi.org/b_r_i_d_e_words54b1k.pdfIn PDF document text
    • http://dudoxanudito.scienceontheweb.net/70362712623.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://japamitafixe.myartsonline.com/71058835435.pdfIn PDF document text
    • https://d2ffd92d-ad89-4e9b-8359-126286817a3c.filesusr.com/ugd/dd9784_7a1098f9726640989b4dd629b2c80426.pdf?index=trueIn PDF document text
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_29c12d9ffcee48fdb390f9283c5fa4cb.pdf?index=trueIn PDF document text
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_d9bf5c2ffc9f4dcbb92e82f7a89ad531.pdf?index=trueIn PDF document text
    • https://0ddd2631-58c7-464c-86d0-a5d1d8121c04.filesusr.com/ugd/301b85_f392fb2367e9460d99744658cd07a547.pdf?index=trueIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_a3bec39690ff4b8fa0134412f2895ed6.pdf?index=trueIn 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_off0000f167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF167 5696 bytes
SHA-256: 79a34adc16ce25adc910f3b138ff1824190af247d69cd63ab754ffaf32cfb328
font_01_sfnt_off000104f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F2 10604 bytes
SHA-256: 65b7167177fe4b814001d1f8b9cc92b5f4e20b383d04d05073eaa944079f0cd3

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