Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe1da0e31cb836d8…

MALICIOUS

PDF

75.9 KB Created: 2021-03-21 08:31:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c03dd7e1538f8be2d67c6fd34b0d1986 SHA-1: 5add5b16279ad6c1302c48b4ddb052b20118c4fd SHA-256: fe1da0e31cb836d81b103fe08316bffbbf6507342c74b29e7c7fa6799b7d3ef5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://midufefew.ru/123?utm_term=puzzle+box+level+24+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421934/normal_602726c77222c.pdfIn PDF document text
    • http://zuzutogutid.22web.org/sikunediwuzepovoluropafu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420756/normal_604ae459c4e8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474446/normal_601fdc5a098cf.pdfIn PDF document text
    • http://pigovaze.iblogger.org/89737046967.pdfIn PDF document text
    • http://lopixerirerenex.mywebcommunity.org/javascript_blob_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414677/normal_5fdbeb0d2fb18.pdfIn PDF document text
    • http://nefuzixitelu.iblogger.org/83234593932.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nufolupi.epizy.com/quiroga_la_gallina_degollada_analisis.pdfIn PDF document text
    • http://kubenusuwixop.rf.gd/97332997623.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/rigejenogejodanefamazexig.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxegu/2870988912.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/gixejezawituvepajemebajib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4099fef-4b5a-4bf4-8dc7-288f35ae4460/how_to_connect_my_acer_laptop_to_a_projector.pdfIn PDF document text
    • http://fidalanono.myartsonline.com/android_studio_shortcuts_windows.pdfIn PDF document text
    • http://xemunebo.atwebpages.com/89199909170.pdfIn PDF document text
    • http://newemepakirid.myartsonline.com/guvozareduzewurifuzodajug.pdfIn PDF document text
    • http://roxifopovarag.rf.gd/49885968914.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a46006d3-f5eb-46db-8116-31de2ea61bcc/vidow.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_off0000eca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA7 5048 bytes
SHA-256: 2e8559250253c4ebc4a428138063a48cc106b7f88db6b536e0e4a278fb909ff7
font_01_sfnt_off0000fe07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE07 10592 bytes
SHA-256: 07aabb7498a1b8045b09175d444faad5a6bb46253a366b7377092bb96da8c10c

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