Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe4402bb7c624201…

MALICIOUS

PDF

135.0 KB Created: 2021-04-03 14:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 654f19744aacd30152ac1391adb3532d SHA-1: d132d381b0260d6cbc9be290ff74479fa20a4313 SHA-256: fe4402bb7c624201b0554123cdc9590d17679ca9fddd530829a2e37be394f4af
164 Risk Score

Malware Insights

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

The PDF file contains a high number of external links, many of which are hosted on file-sharing services and appear to be part of a link farm designed to manipulate search engine results. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous embedded URIs suggest it's designed to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/123?utm_term=jitsi+meet+installation+guide PDF link annotation
    • http://dmdmassage.com/dbs_ideal_login_guide1avmr.pdfIn PDF document text
    • https://xofusifusu.weebly.com/uploads/1/3/5/3/135312872/3075097.pdfIn PDF document text
    • http://veronaital.space/brickleberry_season_5udf7u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369505/normal_6064c0141a8b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471481/normal_6020ff0e57b51.pdfIn PDF document text
    • https://zatuzura.weebly.com/uploads/1/3/1/4/131453499/duxabaneb-voxewofojirugud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388839/normal_6025bd6a9ca56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418570/normal_5fcdc6c9e8112.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490272/normal_5ff6b2e6e9615.pdfIn PDF document text
    • http://arbitestpark.xyz/948401598384hwfm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4c6480a9-ccec-4c20-853c-cc48681c44ad.filesusr.com/ugd/935adc_d2cdd21d34ef4b19bd135230780bdedf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/gexegit.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/which_is_best_wing_chun_or_taekwondo.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/98231936526.pdfIn PDF document text
    • https://13adc596-845f-4f4a-b539-e2c04a0a4b5a.filesusr.com/ugd/6e2da7_33f76ee0c592435b86fe5698f9fc03ab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pidufozu/how_to_calm_someone_down_who_is_stressed_over_text.pdfIn PDF document text
    • https://ffcd7f67-9b43-45c2-8e44-b15cca9583b8.filesusr.com/ugd/48bf55_573a618441d8431fb3dccee5c67c212d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kujesulad/what_is_probability_in_machine_learning.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/sejirogubekonapilibesofig.pdfIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/loladavawudatowij.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/pumamujadudewizaxedemakif.pdfIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_93b4241f9cd3413a9261711ee0e71227.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dixaleko/69292336472.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/appendix_b_form.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001bf44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF44 5040 bytes
SHA-256: 92d24e09a7d58858dd011ee173bac4a8f42845922b1c362cb1d833df380b37f7
font_01_sfnt_off0001d051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D051 11900 bytes
SHA-256: 085687497033a5657fd86aaa7ba155bf2fc193f4565b3fa06da696b774a70057
font_02_sfnt_off0001f7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F7FF 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf