Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbc4c5f2cf3c4101…

MALICIOUS

PDF

79.9 KB Created: 2021-03-18 08:53:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: bba0ecb66a468c1f694b37c2e7daf3f9 SHA-1: 9e9e2de8ba6741611a6c1f38b161e096f20cea4b SHA-256: cbc4c5f2cf3c4101be9e25e5e00adb230df354896c916acbe98b80a2b5b0a233
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with several pointing to suspicious domains and potentially serving as phishing lures or download sites. The PDF structure and embedded links suggest an attempt to redirect users to malicious content, aligning with spearphishing tactics.

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://druttle.ru/strik?utm_term=venn+diagram+problems+pdf PDF link annotation
    • http://weinmvc.net/2711400654kifts.pdfIn PDF document text
    • http://zoomita.space/gapobugurumipevebibupivozninq.pdfIn PDF document text
    • https://cdn.sqhk.co/vafodagusun/ieAPlea/niwisonurimarudazex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375522/normal_60027bf7bf376.pdfIn PDF document text
    • https://cdn.sqhk.co/paxajirawegu/bXrhjzH/meal_plan_for_bulking.pdfIn PDF document text
    • http://udilische.club/android_high_graphics_games_listiwpy4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483587/normal_6001f308914f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464297/normal_5fe7dd798a71c.pdfIn PDF document text
    • https://cdn.sqhk.co/karapazepot/ghjiJ3j/learn_spanish_language_book.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369763/normal_6008c1507894f.pdfIn PDF document text
    • https://cdn.sqhk.co/bikolazasir/jfWjdKR/rogosogerem.pdfIn PDF document text
    • https://ritipovilij.weebly.com/uploads/1/3/4/6/134650849/nozejon_dupupopotowefo_kusudatuti.pdfIn PDF document text
    • http://fortuneo.biz/6795572724knoh1.pdfIn PDF document text
    • https://wilulesutazi.weebly.com/uploads/1/3/3/9/133997377/pasibam_gipapugibe_gebekotop.pdfIn PDF document text
    • https://jijobowuzum.weebly.com/uploads/1/3/4/5/134590228/5290098.pdfIn PDF document text
    • https://cdn.sqhk.co/waxipefimafa/tQbtKjc/mini_dictionary_java.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446930/normal_604b42ec78d37.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_7cf2eee3969a49bdab5cf4ca23174e38.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/dell_optiplex_7010_replace_ram.pdfIn PDF document text
    • https://50aad03f-9d2a-47e6-be13-abd12f321b17.filesusr.com/ugd/3fd638_bf88dcc6c2834876b55a9f059bc4f3a7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/watajive/blitzer_thinking_mathematically_amazon.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/27178254640.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_off0000f900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF900 5468 bytes
SHA-256: 6f1cfc56ce95980be86c375edd26dd0550e76142c13cfab5a0f0b0851e34d76b
font_01_sfnt_off00010b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B80 11464 bytes
SHA-256: c6365249023bba057e23b7c62435137127c285419439f07bdfb02eaf5398e297

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