Malicious PDF — malware analysis report

Static analysis result for SHA-256 852cffaeb565bbd5…

MALICIOUS

PDF

71.0 KB Created: 2021-03-05 05:59:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 61115bf4da8af377a4d04d354e38eaff SHA-1: 5cb3085c2e5d70651a207dee04892dcd2ef24693 SHA-256: 852cffaeb565bbd533e068cfd48625f72c6e5f078e0b89b23d60b39cff763fa4
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=ions+worksheet+answer+key+pdf PDF link annotation
    • http://vagivosifogezer.22web.org/android_development_language_share.pdfIn PDF document text
    • https://xowuxuwakewobi.weebly.com/uploads/1/3/4/8/134853014/lekopif-woluruxazuv.pdfIn PDF document text
    • https://moxuvobojivoz.weebly.com/uploads/1/3/0/8/130873852/860d40ad.pdfIn PDF document text
    • https://vovinusowoxojik.weebly.com/uploads/1/3/4/3/134349833/toromifikotex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f11c4bf2-12a6-49f8-9590-07a94b689168.filesusr.com/ugd/11276f_0596d5a6d23248bd92e1c06cc3457a45.pdf?index=trueIn PDF document text
    • http://xikusaduxofi.atwebpages.com/febunagazixi.pdfIn PDF document text
    • http://tinijev.epizy.com/41750567492.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/86214435337.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/eleanor_and_park_summary_shmoop.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/jafilozamo.pdfIn PDF document text
    • https://83372c7a-1065-4b07-8284-b64562b46e84.filesusr.com/ugd/035489_6f6699783e5b4b00808b1e631f91ec60.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/demenekulusategetuduf.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/bujebefew.pdfIn PDF document text
    • http://lawaxisagiwog.atwebpages.com/kanzul_iman_quran_with_urdu_translation_and_tafseer_mp3_download.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_off0000da93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA93 5292 bytes
SHA-256: 96000613dad1825bb8d7d2eebb7d90f679e39a5901bc03450ce765ae55457f2b
font_01_sfnt_off0000eca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA7 9984 bytes
SHA-256: 4e69a95d0a9c8856b88141f49c16b741fdadb528712437609ca882e908288f4e

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