Malicious PDF — malware analysis report

Static analysis result for SHA-256 c244809a73e3c80d…

MALICIOUS

PDF

64.3 KB Created: 2021-02-22 16:10:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 6f4a5923c6abc033b03c009b701741d3 SHA-1: a07064b379cea4cc9cf29b144227ac0b1b35d714 SHA-256: c244809a73e3c80dfd8bff0f182c906c94945c0fa7ebb9f00318e41f3f44c361
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML_NYX_PDF_MALICIOUS and ClamAV detections further confirm its malicious nature. The file likely serves as a lure to redirect users to phishing sites or download further malicious content, leveraging the embedded URLs for this purpose.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=everyday+use+by+alice+walker+text+dependent+questions In PDF document text
    • https://cdn-cms.f-static.net/uploads/4419836/normal_601e7f151a845.pdfIn PDF document text
    • http://zumikavu.22web.org/smoking_kills_pic.pdfIn PDF document text
    • http://nixejawoxakubi.22web.org/zepoga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390661/normal_5ff3c0e96bcfe.pdfIn PDF document text
    • http://romabuxaxaxo.iblogger.org/44511506482.pdfIn PDF document text
    • https://rabusefikitane.weebly.com/uploads/1/3/5/3/135314736/paxatubutubu-zekav.pdfIn PDF document text
    • https://latimemoniborij.weebly.com/uploads/1/3/1/4/131437487/bapasinibo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387035/normal_60334f794e408.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
    • https://s3.amazonaws.com/mubemutolewe/2019_calendar_google_sheets_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/arduino_nano_v3_datasheet.pdfIn PDF document text
    • http://wuzugimekiwetad.epizy.com/oc_character_sheet_deviantart.pdfIn PDF document text
    • http://dojopugoput.epizy.com/99412616392.pdfIn PDF document text
    • http://nilijevenenox.epizy.com/extremely_hard_christmas_word_search.pdfIn PDF document text
    • http://duvexarido.epizy.com/dungeons_and_dragons_2e_monster_manual.pdfIn PDF document text
    • http://rufevobovejexe.rf.gd/kikiluji.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_off0000b2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B9 5556 bytes
SHA-256: c2530ee8eea81df85e983251f07c553c0cf858e8da7d38c843bf58b5b516b586
font_01_sfnt_off0000c5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BD 9408 bytes
SHA-256: b267a67410d43960d1040521cb7e801e04ead2472472d4207e5f657ac8e7bb17
font_02_sfnt_off0000e5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D5 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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