Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e3d04d600e2dbd…

MALICIOUS

PDF

79.2 KB Created: 2021-03-28 08:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea24a6093e6ee0888c4f8a6c0dcc9d93 SHA-1: 28a3ba2f7d44bd2fff045b2bfe408113df5d0c8c SHA-256: c5e3d04d600e2dbd0a996fa6f0c86d349b215e8f6f24b291c7046dbc5b36216f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used to create link farms for SEO manipulation or to redirect users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior. While no scripts were directly extracted, the presence of external URLs and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a phishing or malware distribution intent. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/award?keyword=achtung+panzer+pdf+espa%25C3%25B1ol
    • http://fivepazako.22web.org/android_13_int.pdf
    • https://cdn-cms.f-static.net/uploads/4464313/normal_60464d384f64e.pdf
    • https://static.s123-cdn-static.com/uploads/4422643/normal_6003e5763b308.pdf
    • https://static.s123-cdn-static.com/uploads/4407747/normal_600555b7ccdab.pdf
    • https://static.s123-cdn-static.com/uploads/4426813/normal_5fff97ad65751.pdf
    • http://kiwufaninini.22web.org/android_vs_apple_users_2018.pdf
    • https://cdn-cms.f-static.net/uploads/4370547/normal_60159d029850b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/purixifusipelid/is_canon_mg5320_airprint_compatible.pdf
    • https://s3.amazonaws.com/fulazelof/bazipolomakivanelonuni.pdf
    • https://167c2301-eccc-4e3a-a609-38a4f17b9bf8.filesusr.com/ugd/b1dabf_62fc29f86e62438db21861105ec3148d.pdf?index=true
    • https://s3.amazonaws.com/wefadep/xilisoft_video_converter_ultimate_portable.pdf
    • https://144ece88-722e-4d59-a9d1-ae16887514c2.filesusr.com/ugd/48b17f_980bbd53f00a4b709980068b6552d60d.pdf?index=true
    • http://mewobunodume.rf.gd/kesariya_balam_song.pdf
    • https://316b94d8-f1eb-4552-9621-e6dada6029ed.filesusr.com/ugd/4b675a_d984e5947f5949d3b79588abc6313fb3.pdf?index=true
    • https://s3.amazonaws.com/zonivezada/vedufutojexoxefumoz.pdf
    • https://s3.amazonaws.com/kovezodepugov/59249770424.pdf
    • https://0ea1ff7f-05b3-43a2-9744-178351a05ed1.filesusr.com/ugd/01f9b9_5dafa6afdc2f4649be3460f1c16de339.pdf?index=true
    • http://gigigij.rf.gd/urticaria_y_angioedema.pdf
    • http://segoxegigo.epizy.com/altered_state_of_consciousness.pdf
    • https://s3.amazonaws.com/tetofamuxulil/audit_report_sample_for_inventory.pdf
    • http://xexelakufakeze.epizy.com/cisco_packet_tracer_new_version_free.pdf
    • http://jefuxizimume.rf.gd/bookkeeping_business_plan_template.pdf
    • http://sujobej.epizy.com/passive_voice_worksheet_grade_5.pdf
    • http://mujelagikajuju.rf.gd/fibikudatebadex.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f005.bin
194a2662f4a61d9b2fa329cceb0b23ffd9a14750f4f8654b572b978569debe13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF005 5668 bytes
font_01_sfnt_off00010317.bin
974ec104e25095b398786091d6946de04fd7b5e6fc3d26a3b6210a91e1347d64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10317 14056 bytes

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