Malicious PDF — malware analysis report

Static analysis result for SHA-256 4297d12797e85c7f…

MALICIOUS

PDF

72.9 KB Created: 2021-03-12 13:42:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df5976cf1010c7b5e30c716ab33c6968 SHA-1: 78043c1811d09518a688d95bc431e3ce005f46a8 SHA-256: 4297d12797e85c7f9f9fa1558e192621cf3c73ef4f74e4298050e44090cd4041
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by heuristics as a link farm designed for SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ponafet.ru/123?utm_term=temperature+conversion+worksheet+answers
    • https://cdn.sqhk.co/piwizogir/dzjh9xE/mobizen_screen_recorder_for_samsung_pro_apk.pdf
    • https://nakenofol.weebly.com/uploads/1/3/0/8/130814118/358218.pdf
    • http://cocobeautybar.ca/wodonaxudovewutagiguj88zn3.pdf
    • https://guzaxogovi.weebly.com/uploads/1/3/4/6/134651677/8433526.pdf
    • http://premiumpornclips.com/vupeguxuvesiptygkx.pdf
    • http://prizinsta24.space/114_chakras_listcthli.pdf
    • https://mokekisinuru.weebly.com/uploads/1/3/4/3/134366850/9eaffba8643.pdf
    • http://dafujopinax.22web.org/prueba_de_antiglobulina.pdf
    • https://cdn-cms.f-static.net/uploads/4422377/normal_601fe6c6aa469.pdf
    • https://cdn-cms.f-static.net/uploads/4450340/normal_600d5a62aca8b.pdf
    • https://cdn.sqhk.co/nizivatitogu/gjjh7ge/33545213320.pdf
    • http://vorgazme.com/footlocker_marketplace_mall_rochester_nyk787j.pdf
    • https://nagejezesalu.weebly.com/uploads/1/3/0/8/130874580/tenotukod.pdf
    • https://cdn.sqhk.co/tuxonewebuke/idChfPC/jarixuk.pdf
    • http://jejepofat.22web.org/hazardous_biological_agents_regulations.pdf
    • https://cdn-cms.f-static.net/uploads/4473030/normal_60153fe2c6ca7.pdf
    • https://cdn.sqhk.co/xagaxubibiz/jg1ByYQ/61690710500.pdf
    • http://roman-holidays.shop/78838086407mm0k2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bivatirovasivoj.epizy.com/how_to_thread_my_brother_lx-3125_sewing_machine.pdf
    • https://s3.amazonaws.com/sigobija/60609853650.pdf
    • http://guxefezuguwi.epizy.com/74755180276.pdf
    • https://s3.amazonaws.com/lakadutof/79881117390.pdf
    • http://wawaxujogoned.rf.gd/62355513669.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_off0000e0ec.bin
ae7cc6bddb3adf4d109872f093741d0508debea2a03babb204fdac9fb1737951		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EC 5308 bytes
font_01_sfnt_off0000f2df.bin
72dacceb0f949f2a722ba327a881bee911f0b47a7875ba3e98574b87198d8a67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DF 10324 bytes

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