Malicious PDF — malware analysis report

Static analysis result for SHA-256 51017f9990db3166…

MALICIOUS

PDF

80.4 KB Created: 2021-02-27 00:41:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 50ccb08388a0989842d7b71abf771ccc SHA-1: 80b2970451f24d205ec0ec88fba64cd855fc70cd SHA-256: 51017f9990db31661c0ee135301d5c8d06e5579ca3d2c4ef08645c575fff99c2
156 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 0.9998

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 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.
  • 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://bologen.ru/wix?keyword=kensei+monk+revised PDF link annotation
    • https://kawavugin.weebly.com/uploads/1/3/0/8/130874435/pupupetek_janabemoves_nalanonovarasip.pdfIn PDF document text
    • http://jawazapefaxuzit.mywebcommunity.org/40001866701.pdfIn PDF document text
    • https://cdn.sqhk.co/gasupewu/idgejip/new_movies_on_netflix_october_2020.pdfIn PDF document text
    • http://naliputa.mywebcommunity.org/74614638754.pdfIn PDF document text
    • https://cdn.sqhk.co/gadewekunel/jglja1f/kpop_store_online_germany.pdfIn PDF document text
    • https://cdn.sqhk.co/nodewanase/hhbCQdF/bunny_popsicle_sticks.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/rebomedug/aqualin_water_timer_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/daily_lesson_plan_blank_template.pdfIn PDF document text
    • http://duziroro.myartsonline.com/linux_study_material_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/79531950459.pdfIn PDF document text
    • http://kaloruligot.onlinewebshop.net/pedube.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/albion_online_build_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/judomivuvob.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/jotox.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/dell_b2375dnf_factory_reset.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_off00010151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10151 4824 bytes
SHA-256: b5f3ff61de729812edf3a944682503685648735424b55a3b2856d4e90a300b43
font_01_sfnt_off000111aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AA 10184 bytes
SHA-256: 6ecaeeb77887a27acb7785e44f759420e85f1b5f58fa1c6c3deb91cfdf3d2ffb

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