Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7390e28500fc369…

MALICIOUS

PDF

105.7 KB Created: 2021-03-21 12:35:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b40c2df1a0d0835dda1c28aa700c8bb0 SHA-1: 110ee939a61d55bb95320b7d1d663660c6da2346 SHA-256: a7390e28500fc369b8b5abd894d8bdab1f7b032daecaa3e4598c8816b95f9d3b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are used in a link farm, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a phishing site or download further malicious content. The presence of external URIs and the link farm heuristic suggest an attempt to direct users to malicious infrastructure.

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://jacksth.ru/strik?utm_term=toro+snowblower+parts+for+521+snow+thrower PDF link annotation
    • https://cdn.sqhk.co/vopufepivipe/dVjjVPA/90899698540.pdfIn PDF document text
    • https://cdn.sqhk.co/kafosine/je5jcUa/dinigaxisejozabef.pdfIn PDF document text
    • https://cdn.sqhk.co/modebopogut/hfjaMic/36309316263.pdfIn PDF document text
    • http://abanca-electronica.com/dudixijasoxiwebevanafifaf550k.pdfIn PDF document text
    • http://mp4.design/pdf_brochure_print0rfbj.pdfIn PDF document text
    • http://trokot-online.xyz/toca_kitchen_online_free_playjmw13.pdfIn PDF document text
    • https://cdn.sqhk.co/nopawuwam/TNw4ImW/cute_wallpapers_for_iphone_7_plus.pdfIn PDF document text
    • http://xplaintome.ru/4g_lte_browser71zx5.pdfIn PDF document text
    • http://unreguezff.rest/nuguwud5g14.pdfIn PDF document text
    • https://cdn.sqhk.co/wafavalufa/ih1hijj/fidezudufibigasexelujin.pdfIn PDF document text
    • https://cdn.sqhk.co/bewamufara/jhBidjh/audiotoolbox_ios_tutorial.pdfIn PDF document text
    • http://artemk.ru/absorbent_mind_maria_montessori3q85g.pdfIn PDF document text
    • https://cdn.sqhk.co/nokodexuxof/1UxihAX/32149854000.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dosalapasenow/zujosefepa.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/72916793755.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/587b6c48-9be0-4afd-b1ea-69252070cf4f/libeduwanonagurelejono.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fc6925f-a7ac-43e5-84d5-03935f4b3e2b/91504636008.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

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000152a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152A5 5216 bytes
SHA-256: bb0c41077cdc2e76425832a2c424714281b1fd63df996c80bde2865b93540c21
font_01_sfnt_off0001646f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1646F 10960 bytes
SHA-256: 398dd3024019d8ea9825ceee8a367f8437b2dae9ca19ea914fdeaea6bd5bde37
font_02_sfnt_off000189c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189C2 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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