Malicious PDF — malware analysis report

Static analysis result for SHA-256 281fd80ac9ad1c7e…

MALICIOUS

PDF

79.1 KB Created: 2021-02-16 21:58:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: fc0ddebf5375c6229d2455be89b65d78 SHA-1: 2beb86ede075cba43b953a09d4a9e56d46b1afe5 SHA-256: 281fd80ac9ad1c7eb4e97aabbeb998c3ac24f146ee3e31329df3a586ddd6397b
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. Many of these links point to potentially malicious domains, suggesting an attempt to redirect users to harmful content or phishing sites. The ClamAV detection and ML classifier further support the malicious nature of this PDF. No scripts were extracted, but the overall structure points to a link farm attack.

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://jacksth.ru/123?utm_term=2d+3d+shapes+worksheets+grade+1 PDF link annotation
    • http://biomanix.best/the_human_centipede_full_movie_480poxg4g.pdfIn PDF document text
    • http://juxefagag.22web.org/dublin_airport_flights_information.pdfIn PDF document text
    • http://trysalon.xyz/2993564703954o3z.pdfIn PDF document text
    • https://nitafigiwulizo.weebly.com/uploads/1/3/1/4/131406945/dexawimidufuvap-majuki-tizorojojemudo-kulor.pdfIn PDF document text
    • http://dk-inc.xyz/denon_avr-x2200w_firmware_update_2017f7qpv.pdfIn PDF document text
    • https://woninulanomawij.weebly.com/uploads/1/3/4/6/134670754/46907adb53c08.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://suvuxugoboboju.rf.gd/chemistry_dictionary_for_pc_free.pdfIn PDF document text
    • http://lagarudu.epizy.com/marriage_agreement_ontario_template.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/73459788794.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/28379851470.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/rapesapabanapelek.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/bimogitoviserinubisakuro.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/glencoe_mcgraw-_hill_geometry_answer_key.pdfIn PDF document text
    • http://fategag.rf.gd/march_2019_current_affairs_ibps_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/9243965102.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/human_relations_definition.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC01 5232 bytes
SHA-256: 1356778870b63595f50fef3c528415eceee8baf047d902c40b72c034672d08a1
font_01_sfnt_off0000fdf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF1 10184 bytes
SHA-256: c1f88d76af07c8c9aec76f883b6734e953e02372a42c2ae604f1731083a70e0c
font_02_sfnt_off000120d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D9 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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