Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef1adf18aac1ffd…

MALICIOUS

PDF

83.5 KB Created: 2021-04-01 20:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ac3d56ebedd77beb68875c768b635f3b SHA-1: 1175c36caf2601f11b0422cf6be197ec68897af4 SHA-256: 6ef1adf18aac1ffd4544a80d5673bcd2f36d97650837a9db9626c1aa9d303bef
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 0.9998

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://jacksth.ru/strik?utm_term=twilight+saga+full+movie+download+in+hindi+filmyzilla PDF link annotation
    • http://gooddevice-online.com/17533836686r5h6n.pdfIn PDF document text
    • http://wavoxibex.iblogger.org/eyewitness_weather_video_worksheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472491/normal_605f91011c35c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409801/normal_60045bee5204b.pdfIn PDF document text
    • https://cdn.sqhk.co/jovakuki/aEfihjb/zituvexexap.pdfIn PDF document text
    • http://aslixan.com/40447863208fmn72.pdfIn PDF document text
    • https://cdn.sqhk.co/fesakesovoka/eibOnb7/baby_alive_doll_real_as_can_be.pdfIn PDF document text
    • http://tevoriveterusof.22web.org/ba_llb_date_sheet_2019_mdu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530712/normal_5fc6db4ad2514.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pexevogawi.epizy.com/mulejupujupaxamo.pdfIn PDF document text
    • http://lasikip.rf.gd/alexa_app_for_echo_dot.pdfIn PDF document text
    • http://vawuwafakevem.epizy.com/79576146857.pdfIn PDF document text
    • http://mipobigagove.rf.gd/kupekowemagigiramine.pdfIn PDF document text
    • http://godidab.epizy.com/tisawofinajuvasevivudi.pdfIn PDF document text
    • http://nimoxorud.epizy.com/what_is_the_best_training_app.pdfIn PDF document text
    • http://mosupemerumen.rf.gd/snapper_zero_turn_lawn_mower_owners_manual.pdfIn PDF document text
    • http://letedimakomewop.epizy.com/georgia_drivers_license_test_languages.pdfIn PDF document text
    • http://rekurotarepogo.epizy.com/nagipewatoranumenozejedu.pdfIn PDF document text
    • http://zaluketiwif.epizy.com/the_notebook_novel_summary.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_off0000f247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF247 5480 bytes
SHA-256: b6d98b1db5c37cf378a0b3e1bbac8ebf0613b0dd48ed107433bb4406422e634b
font_01_sfnt_off000104f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F4 11028 bytes
SHA-256: e24dc8fb9630f79f39a92a00273e476a26dd5de762854a535adda79a15cfad83
font_02_sfnt_off00012ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC8 16164 bytes
SHA-256: 4bd16c8abd39118228c1571b0005d4eb3b3e943e572fd92a2a80cfcb7b749349

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