Malicious PDF — malware analysis report

Static analysis result for SHA-256 8386c3cac4eb8ee2…

MALICIOUS

PDF

69.7 KB Created: 2021-02-24 21:30:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 718525033921e133d8c97470b9f530ac SHA-1: 22e94017f870e390d985123616f571aeb6b4bdc4 SHA-256: 8386c3cac4eb8ee20ac0068f8990cf3c3691db6ed9c2a116a9d2675c67d60971
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, many pointing to disposable domains, indicative of a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for credential harvesting or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs are sufficient evidence of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/123?utm_term=pioneer+avh-4100nex+reset+password PDF link annotation
    • http://tejovotemikodes.getenjoyment.net/denokorinimobokoladagax.pdfIn PDF document text
    • https://wezisewego.weebly.com/uploads/1/3/5/3/135342704/1a19e6a.pdfIn PDF document text
    • https://jefaxuler.weebly.com/uploads/1/3/0/7/130775921/manakok.pdfIn PDF document text
    • http://beremoter.online/world_history_common_assessment_answersncjwz.pdfIn PDF document text
    • https://nonaxoboru.weebly.com/uploads/1/3/4/4/134467623/e9c11388b0.pdfIn PDF document text
    • http://dihtyar.online/kofemazukatezepubug1h45.pdfIn PDF document text
    • http://topidanom.22web.org/good_night_smiley_gif.pdfIn PDF document text
    • http://9gusevshop.website/iihf_world_hockey_championship_power_rankings35t3h.pdfIn PDF document text
    • http://gexopidikimo.mygamesonline.org/wezexupesubujofaxujabo.pdfIn PDF document text
    • https://lafezarawowaw.weebly.com/uploads/1/3/0/8/130874252/1258445.pdfIn PDF document text
    • http://dajexori.mypressonline.com/what_does_chance_mean.pdfIn PDF document text
    • https://nalovitifa.weebly.com/uploads/1/3/4/6/134600698/4737975.pdfIn PDF document text
    • https://benefirezunaxo.weebly.com/uploads/1/3/4/8/134864331/nunuzotux.pdfIn PDF document text
    • http://stakingyfi.com/xefopolasepowukasozuzudn4f8.pdfIn PDF document text
    • https://koredude.weebly.com/uploads/1/3/1/4/131406285/mikezo.pdfIn PDF document text
    • http://lunatan.medianewsonline.com/how_a_bill_becomes_a_law_philippines.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://relogevavikidid.epizy.com/23746520845.pdfIn PDF document text
    • http://sakikuzugodo.rf.gd/css_tutorial_youtube_for_beginners.pdfIn PDF document text
    • http://sedoguzod.rf.gd/hp_photosmart_d110_driver_windows_10.pdfIn PDF document text
    • http://wonetone.rf.gd/67108794571.pdfIn PDF document text
    • http://sarozaxag.epizy.com/vocabulary_workshop_level_d_unit_5_test.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_off0000d348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD348 5548 bytes
SHA-256: 3012d873d1d413b0f5a862052e084488db21e7bdacb6c723f28594833ea57031
font_01_sfnt_off0000e64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64A 10272 bytes
SHA-256: b004a528bdf1c63cf0b4b815a29871a0f2d75cf983868b83d24cad133cd8287d

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