Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c16b9dd1aa14931…

MALICIOUS

PDF

149.1 KB Created: 2021-05-14 08:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 603e315de74c117b19fbf749a904328d SHA-1: 5a43316db2dd3022b70ba23c457c841d51886014 SHA-256: 8c16b9dd1aa14931361ae8ea0465a3f7ff18148806d41ba21e12054a445906da
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The file contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' in one of the URLs further indicates a phishing or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://xezojetit.ru/strik?utm_term=la+biblia+hablada+mateo+capitulo+5 PDF link annotation
    • http://figuxovutofid.mygamesonline.org/simple_interest_and_compound_interest_questions_in_hindi.pdfIn PDF document text
    • http://tuduvodakep.mypressonline.com/7th_grade_math_games.pdfIn PDF document text
    • http://xunetokawetik.sportsontheweb.net/gujarati_baby_girl_names_book.pdfIn PDF document text
    • http://vujenixuwo.mypressonline.com/tasonugaxenisadafosikad.pdfIn PDF document text
    • http://suzofovolavuk.scienceontheweb.net/aristotle_political_thought.pdfIn PDF document text
    • http://japamawosoj.mygamesonline.org/99918863705.pdfIn PDF document text
    • http://godezigupo.mywebcommunity.org/40060272763.pdfIn PDF document text
    • https://cdn.sqhk.co/tamoravuwera/JcgdTWN/republique_dominicaine_carte_du_monde.pdfIn PDF document text
    • http://wajazenizur.mywebcommunity.org/12412769667.pdfIn PDF document text
    • http://fukuzowi.sportsontheweb.net/62076545310.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuvuzevo.atwebpages.com/72067088028.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/787a02ca-f37c-4589-8bea-4f3f28bf27e3/28165074029.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cc3682d-53e3-4ea1-acb3-9ad8a1b3a7e3/83618352831.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fd2bfe8-77b5-47cc-b56f-70c27d08bb11/65777215437.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ec7cc8b-6379-4992-b378-0c240c1000a9/76110485788.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0afadb0c-2872-4645-a342-b9717e6f469e/tilaxigugefir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fddc5ee9-e0a1-4039-8740-1d9cf80f211a/tenulixat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/463c3644-286f-4abe-8191-846f0619c255/foundation_and_earth_ending.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F218 5244 bytes
SHA-256: 22a1f16d0462e2ea0d29c90a078e4c8ac125e99865bd56f8a25547cb1b3b1548
font_01_sfnt_off000203c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x203C6 13624 bytes
SHA-256: 559d03c16a9ef6102fa95a9f088c267bb78d47025a91fd0b390efeb9de4d1527
font_02_sfnt_off00022f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22F49 16368 bytes
SHA-256: 66f4d0a21680ab9bd5b69f16e6816e3bdeff8788d547ccd92716560e812dd3e6

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