Malicious PDF — malware analysis report

Static analysis result for SHA-256 216d26d82fd1556b…

MALICIOUS

PDF

73.8 KB Created: 2021-03-31 08:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: ffdfad1d27d22ee184688b19ced376b7 SHA-1: c55e2f5c4ac0dac7194420744165297a0e085042 SHA-256: 216d26d82fd1556bad0c6cfe89c914515e713502927c2b13bdd07ca741a4ec04
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm or SEO spam tactic to drive traffic to potentially malicious sites. The embedded content, though heavily obfuscated, likely serves to disguise the malicious intent and lure users to click on the external URLs.

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://soxebez.ru/award?keyword=calendario+mensal+setembro+2020+pdf PDF link annotation
    • http://favetemujiresa.22web.org/assembling_a_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478141/normal_603ea9ab5f826.pdfIn PDF document text
    • https://rimemukevip.weebly.com/uploads/1/3/4/3/134318995/7178279.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367961/normal_5ff581a91ddc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378843/normal_604074e076309.pdfIn PDF document text
    • https://nalodewemutut.weebly.com/uploads/1/3/1/1/131164475/5470372.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450240/normal_5feb7be397b33.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f05e994c-9220-4d95-8b6a-af9cd4eae9fd/where_to_buy_the_cheapest_keurig_coffee_maker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62a9c228-28eb-4230-ab14-440f858e4aa8/92876634159.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/leave_request_format_for_one_day.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/30470993468.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/96917628661.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/felaroxufutepuguwo.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/79656290589.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19bf9d49-d592-4ede-a94f-423021af2727/93338500961.pdfIn PDF document text
    • https://s3.amazonaws.com/jigezilor/29530398375.pdfIn PDF document text
    • http://gekavitominugi.epizy.com/bofisedesuwowow.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/aplicacion_acceso_remoto_android.pdfIn PDF document text
    • https://s3.amazonaws.com/kimone/basic_english_speaking_free_download_in_telugu.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_off0000df05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF05 5508 bytes
SHA-256: 2758b233725b4d73e37057c3323eaac531411e0b4536b3f3eb126f388ce10b15
font_01_sfnt_off0000f198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF198 12396 bytes
SHA-256: 6e52097ecdbdc01aba8bfa8f4b474abe9116a1facd53f43660828c243a7fa01a

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