Malicious PDF — malware analysis report

Static analysis result for SHA-256 17332be5bbb84f31…

MALICIOUS

PDF

132.6 KB Created: 2021-05-12 22:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 23bd24723e8d394090dc2cb941d37011 SHA-1: 7aeb94bfe16de8ecea670f692a1d2b59bebaa4a6 SHA-256: 17332be5bbb84f319bd0ab92f0149b9169054969018e296332159e079c4268aa
194 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and external link farm heuristic point towards an attempt to host malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • 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.
  • 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.
  • 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://dugedepap.ru/strik?utm_term=baofeng+uv-5r+plus+specs PDF link annotation
    • http://smartcreditus.info/best_platform_games_ios_2018xw4f6.pdfIn PDF document text
    • http://giftcard-sale.store/mafebevexuzifutetigex2m31e.pdfIn PDF document text
    • http://afracheat2.xyz/movisimawilonazafukj8jh8.pdfIn PDF document text
    • http://ulekschool.online/2059705661598nyh.pdfIn PDF document text
    • http://tersq.fun/numoxadorofajumip14g5i.pdfIn PDF document text
    • http://purukewabe.iblogger.org/sifatafakamozoniwu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_f6fc4309a680449790121327b944feee.pdf?index=trueIn PDF document text
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_2470fbff7a314b5a860d19ef4a885a4e.pdf?index=trueIn PDF document text
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_c51ca07673564d2780fc71889f3b0390.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/dilbert_random_performance_review_generator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f88f30c2-af41-449b-b214-8bddbf6d19fc/sp_racing_f3_acro_osd.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/wepigaxijixo.pdfIn PDF document text
    • http://pilivizelonula.epizy.com/poworoponazeliwivipuron.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/cheat_sheet_dplyr_r.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/958f2c69-c4b4-4e56-884b-dfd8bd091416/student_information_system_thesis_documentation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8c1f267-7a12-4848-a925-6822369536c6/prepositional_phrase_worksheet_4th_grade.pdfIn PDF document text
    • http://muxenad.rf.gd/kindle_android_read.pdfIn PDF document text
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_320c2908d9c84ddc9aaf18c377ca2f21.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/275c37dd-77ab-477b-8f07-3ef18ec47fb2/zebra_gk420d_driver_windows_7_64.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40d57225-d904-4880-acae-817c80c2cfcf/fukulixana.pdfIn PDF document text
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_88f23068a1b44466ad61f16c66e50620.pdf?index=trueIn PDF document text
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_794e6dee451344419fbcec6a9a7951cf.pdf?index=trueIn PDF document text
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_5824b20c13e547c29229e78c32e2054d.pdf?index=trueIn 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_off0001b0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0A1 4496 bytes
SHA-256: b88c394fe43c6ffe6f433855ce2e002f4dc41b042c3ce2e0c5699a80f8c5ed3a
font_01_sfnt_off0001c08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C08F 5448 bytes
SHA-256: 0ecefc026c3dc1fcebd8889474c055e212e6385160a40af6cb927a24b778c72b
font_02_sfnt_off0001d344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D344 13908 bytes
SHA-256: 9ebbe2e908709c01a87e0a73c0c9dba969ffd522e90325cae6aad1a786f44e33