Malicious PDF — malware analysis report

Static analysis result for SHA-256 93fd86e990b8d167…

MALICIOUS

PDF

104.8 KB Created: 2021-04-19 09:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 979fd9d859fc2fe33d17b3a00f980ae7 SHA-1: 3d3d4cfdfbeadca8e510a4c0d17befd3edeb872d SHA-256: 93fd86e990b8d167b70f49c383545b79a748308c87b26d24969a5fa7802883dd
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 0.9997

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://midufefew.ru/strik?utm_term=twilight+eclipse+full+movie+youtube PDF link annotation
    • http://blue-tick-central.com/london_william_blake_analysis_bbc_bitesizeutj85.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379969/normal_6000744d18437.pdfIn PDF document text
    • https://ludebopukum.weebly.com/uploads/1/3/1/3/131380916/xefimusajoleg_marap_tatutupivi.pdfIn PDF document text
    • https://lozugukavokukes.weebly.com/uploads/1/3/4/3/134357100/9070041.pdfIn PDF document text
    • http://in-step.shop/breakfast_at_tiffanys_full_movie_hd_downloadc8uun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455381/normal_60660751dc425.pdfIn PDF document text
    • http://kersita.fun/how_much_is_premiere_pro_a_yearl1fn7.pdfIn PDF document text
    • https://geromebazur.weebly.com/uploads/1/3/4/8/134895645/56505139c618c04.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_2e2d460451a0492f85efae0f87e909b3.pdf?index=trueIn PDF document text
    • http://gafomawonerif.rf.gd/bhartiya_samvidhan_ki_visheshta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70e9203e-02fb-4012-a574-44983f9d1215/is_toronto_the_coldest_city_in_canada.pdfIn PDF document text
    • https://42172c5f-463d-425f-bc49-3536d5e9b788.filesusr.com/ugd/3e9aab_f30364c4dba2499c8a6e5890070b65e2.pdf?index=trueIn PDF document text
    • http://vakewexapenox.epizy.com/free_vpn_ios_direct.pdfIn PDF document text
    • http://jasekebi.rf.gd/xenuruputesuzusu.pdfIn PDF document text
    • http://radujexoxetapil.epizy.com/86522934451.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cf1ab4a-bc68-4f66-b130-fa5152b2f8e8/poriroz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2892044b-2af9-404c-9afa-3ee5608c4669/alaska_driving_license_practice_test.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_off00015bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BAB 5468 bytes
SHA-256: a81216c3e082a9d3a72689cd16b7998d0a257aaf3cf54481a9e5f4dcd47209d3
font_01_sfnt_off00016e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E48 11488 bytes
SHA-256: e0928ed9b4793964139e1ceafdaed67f1cdb188b3741d329f684ee09e201c43a

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