Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f663a1c0cec67e8…

MALICIOUS

PDF

85.3 KB Created: 2021-03-18 00:11:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 0187bca7125cb9f7e36722c494b35392 SHA-1: ae9c8e0d8744863a7fb50f0afad20beed8d03b29 SHA-256: 3f663a1c0cec67e80ed547b472d4df5e0ed1d13fdd317cc07fe76d7f282f7362
194 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of a 'download button' lure further supports a phishing or malware distribution scenario.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://vilenefex.ru/aws?utm_term=best+program+for+gym+beginners PDF link annotation
    • https://tefojemitadu.weebly.com/uploads/1/3/1/6/131606809/c8d596b88fc2c.pdfIn PDF document text
    • https://cdn.sqhk.co/pulizojiwim/hjhc1ib/hide_and_seek_imogen_heap_remix.pdfIn PDF document text
    • https://zofizefeva.weebly.com/uploads/1/3/1/6/131636954/pisowe-zaxuzuzuja.pdfIn PDF document text
    • https://cdn.sqhk.co/govazilose/AgghaW0/interview_questions_weakness_answers_perfectionist.pdfIn PDF document text
    • http://cryogen.me/476121266ai4rx.pdfIn PDF document text
    • https://fisotewefupug.weebly.com/uploads/1/3/1/0/131071176/0cbb55d128c67.pdfIn PDF document text
    • https://razemifutibedur.weebly.com/uploads/1/3/4/4/134431978/nuzepijisopiw_keweg_bujisut_komiwugiwefi.pdfIn PDF document text
    • https://cdn.sqhk.co/notizejamebo/hdIshh2/61518967086.pdfIn PDF document text
    • https://nunigagajil.weebly.com/uploads/1/3/4/7/134751499/79480.pdfIn PDF document text
    • http://jezugelevafebir.22web.org/27264703483.pdfIn PDF document text
    • https://cdn.sqhk.co/jesovolavig/RgiPvih/levenidopolexabub.pdfIn PDF document text
    • http://silikidabog.22web.org/45510687778.pdfIn PDF document text
    • http://help-feedback-amzn8.xyz/candy_crush_hack_apk_unlimited_movesnleyn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_fa2c6c24751547fb89ae2096711a814f.pdf?index=trueIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_955d41e4cb9145cc962d2601a654eb2f.pdf?index=trueIn PDF document text
    • https://dd39d194-9042-494f-90ab-223c96cf8da5.filesusr.com/ugd/5d3909_057c030e14cf466d8bceba959f949da6.pdf?index=trueIn PDF document text
    • https://7b4e975e-109f-4397-a679-93e438ff1453.filesusr.com/ugd/c33f71_1170ca7c60f54abb8b29c41e79993e12.pdf?index=trueIn PDF document text
    • http://bazuliditufo.epizy.com/79692208360.pdfIn PDF document text
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_fbfccef78c904b0fad50a6aaa0db9048.pdf?index=trueIn PDF document text
    • https://d67926d6-99fe-48a4-938f-95006fdf2de6.filesusr.com/ugd/21d82e_bf81854641e84dc99d9c7abf4bf7153b.pdf?index=trueIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_f6a4665d871145fa9579ee623b4577c5.pdf?index=trueIn PDF document text
    • http://kexasejuwodeji.epizy.com/attahiyat_in_arabic.pdfIn PDF document text
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_aeaa79d6009b4c779beedb33049aee05.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB3 5480 bytes
SHA-256: 8b34847eddcbe753640c63479a9a22ce4fafabd042bdc3d5934a58614a1166e9
font_01_sfnt_off0001204e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204E 11068 bytes
SHA-256: bfbeccd1a4d1d449c20f73afc0a8bb70abf2f617d54df7b55d9321b2111f3ac2