Malicious PDF — malware analysis report

Static analysis result for SHA-256 f384be4ee6a6f91d…

MALICIOUS

PDF

79.8 KB Created: 2021-03-27 16:35:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c7601c8b1cfadf124efa26650bd84636 SHA-1: 0e15c857798e3bbbcaab7fe2a400308e214353d2 SHA-256: f384be4ee6a6f91d00d7e51c2ee8bf59268f9c9a87ffc92f6a37e7b4cec9eca3
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The presence of a critical ClamAV detection and ML classifier flagging further supports its malicious nature. The embedded URL `https://lozipotod.ru/award?keyword=upload+pdf+to+facebook` is a primary indicator of a potential phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/award?keyword=upload+pdf+to+facebook PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/samsung_grand_prime_plus_battery_price_in_india.pdfIn PDF document text
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_1fc4cea5267e4702bd2326829bba3c99.pdf?index=trueIn PDF document text
    • https://71347f20-8353-4153-bebc-dd2a28b3a5cf.filesusr.com/ugd/a382ee_6b8c6eb3cbef478bbb1c4133dad104c3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/answer_me_jesus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c82dc6e6-4915-422b-a4aa-98fd20d49e79/xiwinipeziminedanamudozi.pdfIn PDF document text
    • https://6323cc82-cf72-43ae-bc7a-f8d691a1d37e.filesusr.com/ugd/4f3578_c1c57f6e655f4b0aa02a17d8a9676fdc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b9966a0-b25f-4ca3-9b47-17b796e863d6/cissp_mcgraw_hill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c55a66a4-b3f9-41c6-8d47-40ee6d8341cb/aprender_ingls_mientras_duermes_descargar_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/wevole.pdfIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_340092364e91468885aede2b1d43df35.pdf?index=trueIn PDF document text
    • https://f8d82b49-d438-4da2-b906-f876cb6fe635.filesusr.com/ugd/12dc78_0976c9c31ca64a09bb915662736a70ba.pdf?index=trueIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_6fc62dbfe86f4d81aaf6fc2be60738f4.pdf?index=trueIn PDF document text
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_10124219834d4bb4837dbe8ac77decc6.pdf?index=trueIn PDF document text
    • https://b6d28218-96ba-4f98-b9c1-0d78b4e6fe84.filesusr.com/ugd/47aa88_92b4e47670a442a1a18493b9fb63e8f1.pdf?index=trueIn PDF document text
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_e84b4833d07b4f97aa68829a13894c2e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/04115af9-08d3-44f1-b006-4491c2dd1c79/76989931622.pdfIn PDF document text
    • https://f98f40d2-b649-4e6b-99af-b89bbf2331ff.filesusr.com/ugd/724bd4_0d09859b09b0485a92f08aa7a8fe8254.pdf?index=trueIn 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_off0000e49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49D 5072 bytes
SHA-256: f9f8f726416247f2c60dd0a231a57457b72c55b0023b9ad98ac2b6ccc632fb1a
font_01_sfnt_off0000f5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F8 11336 bytes
SHA-256: 13eed9a9d7d049aa8ac440a401ddc1c71a9a67b1671ce8ecba3be67e20fd20a0
font_02_sfnt_off00011c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C88 16388 bytes
SHA-256: 534e44c921e8acb9c8e993207df297c85ca6c672af4c6174c05b3ca24a170572