Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf01fb8b217c137…

MALICIOUS

PDF

75.8 KB Created: 2021-03-10 09:03:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 31cf9c898400dc67628d18ef7aaf2e2c SHA-1: 944c8de3c3388bb648f70a7ef62c6d037dd0d14d SHA-256: acf01fb8b217c137030c858234a1ca68f600cf27489940edb8e9b86ecc332c62
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristics suggest it functions as a link farm, with numerous external URIs pointing to disposable hosting, likely to redirect users to malicious content. The document body, though heavily obfuscated, contains text related to a free PDF download, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://golowaki.ru/strik?utm_term=el+juego+del+angel+pdf+gratis+en+espa%25C3%25B1ol PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415944/normal_600d13a1cb68b.pdfIn PDF document text
    • http://pinezotamex.getenjoyment.net/language_barriers_to_effective_communication.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379474/normal_603d3426e8584.pdfIn PDF document text
    • http://xomofaki.getenjoyment.net/24948414803.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477162/normal_5feef854f3a51.pdfIn PDF document text
    • http://fumatiw.mypressonline.com/dinunef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pomigijo.rf.gd/53692485194.pdfIn PDF document text
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_a00c39fe94d54f5aa105f18bec2dd4bb.pdf?index=trueIn PDF document text
    • http://sexepafo.epizy.com/toram_online_dual_sword_leveling_guide.pdfIn PDF document text
    • http://wapinogure.epizy.com/peter_answers_hack.pdfIn PDF document text
    • http://tujotabupogi.rf.gd/propresenter_5_moving_backgrounds_free.pdfIn PDF document text
    • https://e50eee24-2d95-422d-8083-6f618d95927b.filesusr.com/ugd/594ae5_8d3f40ebe2b744618318cbb4540807cb.pdf?index=trueIn PDF document text
    • http://javidukasomeg.epizy.com/gestor_de_archivos_para_android_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/945a9615-313e-4c1e-bfc9-d4c1de0f4906/65230597059.pdfIn PDF document text
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_456d89d7d3064a02ba58d5d972b5ed62.pdf?index=trueIn PDF document text
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_82aedbf112954ade8d2e044c8733a2b2.pdf?index=trueIn PDF document text
    • https://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_0ce0c3fa9fc243c1947cae2bf33ed3cc.pdf?index=trueIn PDF document text
    • http://meletediso.rf.gd/how_to_reset_powerbeats_3_wireless.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/347ff417-deac-4829-917c-2a72c1d4927e/32873988224.pdfIn PDF document text
    • http://niwuzowebod.epizy.com/video_dance_blackpink_forever_young_mp4.pdfIn PDF document text
    • http://podapuleleg.epizy.com/accidents_reported_today_york_pa.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_off0000e656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE656 5456 bytes
SHA-256: 70143b98c5ec2cfd0281c87d5d48bcae858a9775f4c071087ed4d034815f3f37
font_01_sfnt_off0000f8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BA 12032 bytes
SHA-256: 8327cf0879e835ef82d14ddbff86f55df3ed33f80d97ad3644876c394b325457

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