Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a6735f088471715…

MALICIOUS

PDF

78.6 KB Created: 2021-02-25 22:21:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3ccf7b2632a56852510a62676ac104d8 SHA-1: ac8f21093230e9fc9f7739c526f9d6db62870477 SHA-256: 1a6735f088471715e786e6ab92cdd9886b00acecb6d5535d27086268f212c950
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV heuristic strongly indicate maliciousness, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/wb?keyword=dell%20e5550%20release%20date PDF link annotation
    • https://cdn.sqhk.co/mazinatefoso/jbjis15/darkarta_a_broken_heart_s_quest.pdfIn PDF document text
    • https://verigidiloje.weebly.com/uploads/1/3/0/8/130874422/b423d.pdfIn PDF document text
    • http://sakipewo.22web.org/class_11_chemistry_equilibrium_ncert_solutions.pdfIn PDF document text
    • https://towimoni.weebly.com/uploads/1/3/4/3/134340956/dasagawitu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386839/normal_6005f060f0ef2.pdfIn PDF document text
    • http://putifid.iblogger.org/what_does_it_mean_to_be_a_leader_in_early_childhood_education.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/44875986180.pdfIn PDF document text
    • http://xafopawiki.medianewsonline.com/tijibokoridodibevadujo.pdfIn PDF document text
    • http://katipef.medianewsonline.com/maytag_top_load_washer_error_codes_e2_f6.pdfIn PDF document text
    • https://cdn.sqhk.co/dasofuduveje/bsFjjlS/fewibazifoseloba.pdfIn PDF document text
    • https://nobaletakalesig.weebly.com/uploads/1/3/2/3/132302751/4773173.pdfIn PDF document text
    • https://jopokiwajisi.weebly.com/uploads/1/3/4/1/134108554/virawatu-nolufavu-puruwefilapof.pdfIn PDF document text
    • https://nikatomorufaxeg.weebly.com/uploads/1/3/1/4/131437252/3354a743b0281.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://faberaladaruz.epizy.com/tutevef.pdfIn PDF document text
    • http://nununad.myartsonline.com/saitek_x52_hotas_flight_control_system_joystick_pc.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_off0000f800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF800 5084 bytes
SHA-256: 0de87f04329b0eccc9c3fa730875809e91634ebfc9acb3d771ac4eea4543e487
font_01_sfnt_off0001095d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095D 10524 bytes
SHA-256: 00254500dae2f29318fe81b52bb3e32ac6ba392ef1bf62df4c0d098dedeb4a3e

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