Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e40d25348f7a4fc…

MALICIOUS

PDF

83.2 KB Created: 2021-04-01 03:41:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: de9fdf637cfa19ec169787b53862d2b1 SHA-1: cf322a01d52891400872fc7a221503665246c29a SHA-256: 6e40d25348f7a4fc5aa9242ed87397e94e2051a40eb2f15baf85c2298dc3d8d2
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It contains a large number of embedded URLs, many pointing to disposable or unknown hosting, suggesting a link farm or phishing attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://leonvi.ru/wix?keyword=arrl+general+class+license+manual+9th+edition+pdf PDF link annotation
    • http://pexarinolal.mypressonline.com/19922727944.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488604/normal_605b3f88a4ec8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406812/normal_6024144f21bf6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373526/normal_6040db85713d6.pdfIn PDF document text
    • http://pelubexeto.getenjoyment.net/16881613605.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445564/normal_5ff208b29e4d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380681/normal_601148f6baaeb.pdfIn PDF document text
    • http://jewagep.22web.org/51159953102.pdfIn PDF document text
    • http://suvasemujodi.22web.org/70529401487.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460477/normal_5fe3c865411a4.pdfIn PDF document text
    • http://javaxirivibewi.mygamesonline.org/nudos_y_aparejos_de_pesca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466673/normal_5fefe074ccbd0.pdfIn PDF document text
    • http://tinesemexogo.mygamesonline.org/94155060301.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_b919a1dc373b4f4487594c7a29d97848.pdf?index=trueIn PDF document text
    • http://wobuwikag.epizy.com/cystite_hmorragique.pdfIn PDF document text
    • https://6c639bf1-704a-4500-b661-329758898742.filesusr.com/ugd/02d620_72bdd3f5f8c84b85af7ea9ed43e6f7dc.pdf?index=trueIn PDF document text
    • http://kuzelewekupe.epizy.com/are_subway_salad_bowls_healthy.pdfIn PDF document text
    • http://tipisekoj.epizy.com/mere_sai_bhajan_free.pdfIn PDF document text
    • http://kexabomatifub.epizy.com/presentation_announcement_template_word.pdfIn PDF document text
    • http://xuwanozofugis.epizy.com/windows_10_batch_script_commands.pdfIn PDF document text
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_18f2661eb10b447b85505739c667632b.pdf?index=trueIn PDF document text
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_e3a89316b49a4314acdd8b998fe2f028.pdf?index=trueIn PDF document text
    • http://bakajejupuxa.epizy.com/duwagiwuzewurevavijafe.pdfIn PDF document text
    • http://rosukijabadizi.epizy.com/stem_and_leaf_interquartile_range_worksheet.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_off0000ebdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDC 5716 bytes
SHA-256: ffb9db2fc8a130809672a352d48faff6cff7d43c8dbc7aeddee2e79ef0a619eb
font_01_sfnt_off0000ff1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1E 11836 bytes
SHA-256: 19e10b7fade4c3880588d3ca50f848baf52c0848eacb67c8edae8ae360fee560
font_02_sfnt_off0001274b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274B 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501