Malicious PDF — malware analysis report

Static analysis result for SHA-256 43dff8a6291a5614…

MALICIOUS

PDF

78.7 KB Created: 2021-03-16 14:45:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9b56ba2ec41a2ba0a3c074396e76352e SHA-1: 993f30bc61d5a0a4a5f9bf3fa4e1a3acc92a9b11 SHA-256: 43dff8a6291a5614e71ee39143d03a16899b052d574e10b172ef52904c8e49a2
186 Risk Score

Malware Insights

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

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 0.9990

Heuristics 6

  • 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 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://golowaki.ru/123?utm_term=search+all+files+android+studio PDF link annotation
    • https://wunamixexot.weebly.com/uploads/1/3/4/4/134456109/5676423.pdfIn PDF document text
    • http://zobebukore.22web.org/99227953472.pdfIn PDF document text
    • http://zidoruzeb.22web.org/90138452608.pdfIn PDF document text
    • https://lolidinol.weebly.com/uploads/1/3/4/8/134884516/4863059.pdfIn PDF document text
    • https://zagukosi.weebly.com/uploads/1/3/4/3/134314994/vaboju-lujez.pdfIn PDF document text
    • http://feremujidonigu.getenjoyment.net/84033497734.pdfIn PDF document text
    • http://jofufunobek.sportsontheweb.net/dd_5th_edition_character_creator_online.pdfIn PDF document text
    • https://pukapukipek.weebly.com/uploads/1/3/4/6/134636258/6804726.pdfIn PDF document text
    • https://nowuvufeguxebib.weebly.com/uploads/1/3/2/8/132814980/8622382.pdfIn PDF document text
    • https://xilapisozigiv.weebly.com/uploads/1/3/4/3/134341565/miwaxej_zupuwusepow_wuvopi_sirenutikuvixu.pdfIn PDF document text
    • http://jezonikiroka.mygamesonline.org/fisej.pdfIn PDF document text
    • http://naxaliref.iblogger.org/work_systems_and_the_methods_measurement_and_management_of_work_ebook.pdfIn PDF document text
    • https://jameguvifipud.weebly.com/uploads/1/3/4/7/134771166/1abef69.pdfIn PDF document text
    • https://nexitikobimefa.weebly.com/uploads/1/3/0/7/130776699/zikavujev.pdfIn PDF document text
    • https://webegerux.weebly.com/uploads/1/3/4/7/134759049/gurofirexulif-xusinaxag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/2013cfd8-5667-4bfb-ab7c-31c5046ea98c/edward_said_culture_and_imperialism_slideshare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/601b088a-462b-477d-82d2-9dddfd14cc1e/jinosatilisuvetowizerex.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/gewutagurulatejibelujosa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fae2dc1-ea6b-489d-8645-157198d24c43/bavoratadux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f951d542-e74b-4527-a15a-e45bceb36125/dyson_dc35_motorhead_not_working.pdfIn PDF document text
    • http://fugevivoreled.rf.gd/quotes_by_ray_dalio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3ddf5c9-be3f-4b5f-b5d1-6a7db1a01562/senuledexi.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/sears_garage_door_battery.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/simple_division_worksheets_grade_2.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE904 5092 bytes
SHA-256: c549e53d4476bfd0e9451bdd1b2817c32fad1d4b3df3c6a63c47f41912925fc4
font_01_sfnt_off0000fa3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3D 10796 bytes
SHA-256: 7e38c83ca3ce3f46c0d89a81c1977243a606bcae5ff6c8ba556245ddb956d92e
font_02_sfnt_off00011f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F20 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e