Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6ec64f9d132d7cc…

MALICIOUS

PDF

92.0 KB Created: 2021-03-04 16:53:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c4e4d5fb9b1dae964a22100daf548947 SHA-1: b64ca38c54eb3d8a476da5c35d5d89abaf7286e4 SHA-256: d6ec64f9d132d7cce6616a0aa3aab0132b1a5d43da4b749bf9d99590b40cc784
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by heuristics as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the presence of numerous external links suggests an attempt to redirect the user to malicious content.

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://maypoin.ru/123?utm_term=best+3-4+quart+slow+cooker PDF link annotation
    • http://pupalara.22web.org/my_asian_tv_app.pdfIn PDF document text
    • http://toppiksnack.xyz/zekumamozepllct.pdfIn PDF document text
    • http://kernig.online/998392728391uywz.pdfIn PDF document text
    • http://goodik.fun/what_is_the_role_of_plc_automationfxwvv.pdfIn PDF document text
    • https://vetazewufa.weebly.com/uploads/1/3/2/8/132814418/jejizoze-bigulo.pdfIn PDF document text
    • https://bofewake.weebly.com/uploads/1/3/4/6/134695903/1392000.pdfIn PDF document text
    • http://bagesopabiwub.scienceontheweb.net/what_is_the_oil_gas_mix_for_echo_blower.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/luxelula/apc_back-_ups_xs_1300_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8711a0f7-e73e-48df-b9ad-29a6c35b6a4b/what_does_exponent_1_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/sofolejataxuze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/888474b4-4f7d-4e68-8bbf-4bd5852d4c3c/given_the_circuit_below_find_io_using_nodal_analysis.pdfIn PDF document text
    • http://gomusogo.rf.gd/homeless_coalition_in_cincinnati.pdfIn PDF document text
    • http://desakoda.rf.gd/63969739808.pdfIn PDF document text
    • http://tososite.onlinewebshop.net/sujare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58c02f05-e94e-4862-9a5f-cc51e3532399/what_does_the_battery_light_mean_on_a_toyota.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F0 5408 bytes
SHA-256: d6b6913247c95de53944b4c51a64c28732be0aa4d3df9e4fc2b615e267603a2e
font_01_sfnt_off00012991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12991 10652 bytes
SHA-256: e72195344eba4d4cd11978775f29b3d66205510b1b5b2b9873aea91fad9bc5eb
font_02_sfnt_off00014e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E55 16068 bytes
SHA-256: 9e1271d681207e96fe60c94df920a27091a957dc81e2614e9e6235263a34fce6

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