Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd90b99490a3b23f…

MALICIOUS

PDF

116.9 KB Created: 2021-06-05 04:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9d0ea5191eab7ef9237373543953b235 SHA-1: ef6ac7eb81425a9e198a14a0ad942195e3027faa SHA-256: bd90b99490a3b23f77d8ec355d81b3cb6e73e59426e3b82906d40eafd4e7e9cb
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://medvor.ru/pbw?utm_term=what+are+the+two+numbers+to+prank+call PDF link annotation
    • https://pesegoniz.weebly.com/uploads/1/3/4/4/134497823/masenona.pdfIn PDF document text
    • https://surarapumo.weebly.com/uploads/1/3/4/3/134305151/e910a.pdfIn PDF document text
    • https://zorivaleguzovul.weebly.com/uploads/1/3/4/5/134596353/gofobasopiro.pdfIn PDF document text
    • https://nuzubalud.weebly.com/uploads/1/3/4/1/134108962/japuraz.pdfIn PDF document text
    • https://tejebufu.weebly.com/uploads/1/3/4/3/134353082/85f249d4a.pdfIn PDF document text
    • https://tumurotijom.weebly.com/uploads/1/3/4/5/134512141/lelujaweken_vopefolatozumo_sidozevixeduted.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475203/normal_602498ca7953b.pdfIn PDF document text
    • https://wejolizamu.weebly.com/uploads/1/3/4/7/134766198/bunegojob.pdfIn PDF document text
    • https://perelixaji.weebly.com/uploads/1/3/4/8/134881923/rasomalemobinob.pdfIn PDF document text
    • https://dewotime.weebly.com/uploads/1/3/1/6/131606762/6423165.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460231/normal_601ddcb4c1ea8.pdfIn PDF document text
    • https://juwarojolajekol.weebly.com/uploads/1/3/4/1/134108785/meluvawu.pdfIn PDF document text
    • https://zusadubojurumez.weebly.com/uploads/1/3/4/7/134703186/xapiwulepoxabo-nevofevuji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495681/normal_5fd201bf646ed.pdfIn PDF document text
    • https://dupevolorimix.weebly.com/uploads/1/3/4/5/134588768/5691829.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/c8b12691-6a14-4fc1-8838-f6e1f95db053/kibininazefutuxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb986d37-07f0-41cb-b35c-5b568135798a/el_camino_del_artista_julia_cameron_resea.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7f72577-25e4-44b6-b7c2-6cc6f8c2bbf2/arris_tm822_ds_light_blinking_orange.pdfIn PDF document text
    • http://ridelox.pbworks.com/f/how_to_clean_eureka_pet_vacuum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ca557d7-bed9-49a3-8051-46bc6a8d4720/bivamujedajedino.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/f/zunomi.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/w/file/fetch/144419499/xikegofoxa.pdfIn PDF document text
    • http://jesababa.pbworks.com/f/96403593110.pdfIn PDF document text
    • http://farejutotej.pbworks.com/f/8.snf_din_kltr_ve_ahlak_bilgisi_testleri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22e84ab8-1b98-4744-a2b3-ec1804cf4175/tuwuvenonajipanexom.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_off00018aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AA8 5480 bytes
SHA-256: 28fc8db855650bed712199ace31e25e1f37ba79d104d230e8b5dc0010b5c4db1
font_01_sfnt_off00019d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D31 11288 bytes
SHA-256: 9111417354c76f745c45567028a0fd6867f6049d811922704f27996e8066c68a