Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b9a93ca97ff95fb…

MALICIOUS

PDF

73.6 KB Created: 2021-03-28 00:02:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cfa8e887037d9d826b8aa6fe4873c5df SHA-1: 3da72438c755b2f53d8c43d3334e3d337593a158 SHA-256: 7b9a93ca97ff95fbb40770b2facf65d1f498ff2b26bb7c5cf47b17eae8600e82
126 Risk Score

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-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://druttle.ru/123?utm_term=vlookup+data+from+other+sheets PDF link annotation
    • http://nosixavol.sportsontheweb.net/bixisizu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387229/normal_60038b49a8d41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497666/normal_600a0833bfa70.pdfIn PDF document text
    • http://monoga.space/91701636822gurc1.pdfIn PDF document text
    • http://souve.me/59263725528928wn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449012/normal_600964d1781df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365582/normal_5ff1b64ad35a3.pdfIn PDF document text
    • http://xovijezup.mywebcommunity.org/durojog.pdfIn PDF document text
    • http://salestore.pro/denon_avr_x3500h_reviewyy5uw.pdfIn PDF document text
    • https://gaxadujabe.weebly.com/uploads/1/3/0/7/130775632/pevufizasuvatoz.pdfIn PDF document text
    • http://casbah2point0.com/jokejirafovapeliweso3r4r6.pdfIn PDF document text
    • http://demask.space/canon_200d_mark_ii_4k_dslr_price_in_indiacf4mm.pdfIn PDF document text
    • https://fizegebukuri.weebly.com/uploads/1/3/1/4/131453213/414275.pdfIn PDF document text
    • https://zaxizibu.weebly.com/uploads/1/3/4/6/134672664/tijin.pdfIn PDF document text
    • http://sidufapas.mywebcommunity.org/abdullah_calan_kitaplar.pdfIn PDF document text
    • https://tigidejuremu.weebly.com/uploads/1/3/4/5/134502839/mazagipajino.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wororezijetixa.atwebpages.com/luxoloripi.pdfIn PDF document text
    • http://fedonefekipide.myartsonline.com/central_park_zoo_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE234 5312 bytes
SHA-256: bb6e019ea1af1273a607e4d60db1b3dda79c2487905641dee73e8ff0d5e7ebac
font_01_sfnt_off0000f41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41F 10896 bytes
SHA-256: 9246c0b762a6e93038d09041ded465a6b2725e0b553b61189e753d48e88979dc