Malicious PDF — malware analysis report

Static analysis result for SHA-256 11aa689cc4f6a19f…

MALICIOUS

PDF

72.7 KB Created: 2021-03-01 04:08:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: daf086c0ac7792aca0b30837885124c7 SHA-1: b034c2233c36b3d8c7f46811ddf6716f55dffde7 SHA-256: 11aa689cc4f6a19f1aa29c7d313d8fbd5de10a81921269b3b7c619c194dc5401
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically crafted to appear as a search result for 'network spoofer apk latest version'. This suggests a phishing or social engineering attempt to trick the user into downloading malicious software. The ML classifier and ClamAV detection strongly indicate malicious intent, and the presence of numerous external links points towards a link farm used for distributing malware or phishing content.

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://druttle.ru/wix?keyword=network+spoofer+apk+latest+version PDF link annotation
    • http://nasufulorejuwe.mywebcommunity.org/lexozafazawibupalito.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388037/normal_5ff802ef2404a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384028/normal_6013237a4490d.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/hbjjNhd/mumoguxibuluxisusun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445889/normal_600b67ac08378.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497370/normal_5fdd095919960.pdfIn PDF document text
    • http://kapovulup.mywebcommunity.org/tarolukutoworeb.pdfIn PDF document text
    • http://fofiwafajelerax.sportsontheweb.net/20626451781.pdfIn PDF document text
    • http://1s.london/93823950152il4vn.pdfIn PDF document text
    • http://evromotors.net/class_11_applied_mathematics_book_2020-21evwo9.pdfIn PDF document text
    • http://ketousa.site/krita_animation_tutorial_20199tt0c.pdfIn PDF document text
    • https://cdn.sqhk.co/rosomugimo/igeJhjN/xamovumizojesewedoj.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/hhON4gd/lagimitu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380682/normal_60184ca4f1521.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427274/normal_5fec9559c3946.pdfIn PDF document text
    • http://paselon.getenjoyment.net/a_little_history_of_the_world_book_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fiforeru.atwebpages.com/minn_kota_ulterra_112_36_volt.pdfIn PDF document text
    • http://vorisenunajix.myartsonline.com/empire_mini_gs_paintball_gun_price.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_off0000e036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE036 5080 bytes
SHA-256: 4320ca6b6ca8455b17717a293fe5fbe9ea3d3b872388950b358dfcffc271f4e7
font_01_sfnt_off0000f1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AE 10424 bytes
SHA-256: eed7d370289bfe8c815da95d4f0c8fbfc1ebdd0efd5ef34c6344a095e27fd4d5

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