Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35c686d088c383f…

MALICIOUS

PDF

70.6 KB Created: 2021-03-24 11:44:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9b96fcf3df690f6b2ea9d5d9b654c108 SHA-1: 3eafab73d2c830413011f67e3ae13a947a0aaa45 SHA-256: f35c686d088c383f0815a00bb245893f19051c827bc4b91738eb6728d749c835
126 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, many of which point to disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for downloading a second-stage payload. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/123?utm_term=comparative+adjectives+worksheet+3rd+grade PDF link annotation
    • http://gadatoreneperil.mygamesonline.org/how_to_become_a_small_engine_mechanic_in_alberta.pdfIn PDF document text
    • https://sufixekanol.weebly.com/uploads/1/3/4/7/134712322/7534973.pdfIn PDF document text
    • https://fiwisito.weebly.com/uploads/1/3/4/7/134715438/bfa1a0c35f28.pdfIn PDF document text
    • http://rankingcoach-seo.com/pogokawisikadoncvuc.pdfIn PDF document text
    • http://kovuzaxaf.medianewsonline.com/resumen_de_el_libro_de_los_muertos_egipcio.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405946/normal_6006e1c9c6e0d.pdfIn PDF document text
    • https://wuremude.weebly.com/uploads/1/3/2/8/132815206/zemarugixusad.pdfIn PDF document text
    • http://figimumagoko.mygamesonline.org/72241384553.pdfIn PDF document text
    • https://zufodivovogopot.weebly.com/uploads/1/3/1/3/131383523/9343186.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417670/normal_60431df848e0f.pdfIn PDF document text
    • http://rankingcoach-seo.com/levadazivakoxamuneyvcrl.pdfIn PDF document text
    • http://fringigejy.site/adobe_photoshop_tutorials_free_download_for_pcaltw4.pdfIn PDF document text
    • http://meetdouche.xyz/captivity_meaning_in_tamilq33hc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418391/normal_6011ebfae2da0.pdfIn PDF document text
    • http://rujewazaxijaza.sportsontheweb.net/what_is_economic_recession.pdfIn PDF document text
    • http://riwuvodobopexu.mywebcommunity.org/zumonifemodunojip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409797/normal_5fd36a997b878.pdfIn PDF document text
    • https://kegewibenufugix.weebly.com/uploads/1/3/2/6/132682471/barafukirut_bopalenudub.pdfIn PDF document text
    • http://mizafaroremida.getenjoyment.net/active_and_passive_voice_in_tamil.pdfIn PDF document text
    • http://galufixagomedo.getenjoyment.net/24191502791.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474980/normal_5fe4935e4b380.pdfIn PDF document text
    • https://javedaxefu.weebly.com/uploads/1/3/5/3/135314095/1ca868b6793508.pdfIn PDF document text
    • https://lasarowolu.weebly.com/uploads/1/3/6/0/136024073/9265505.pdfIn PDF document text
    • https://bumipavadawafez.weebly.com/uploads/1/3/2/7/132710759/6520119.pdfIn PDF document text
    • http://medicalpracticementor.com/92574401456pzmql.pdfIn PDF document text
    • http://porizaritofo.mypressonline.com/dokaminapewafot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD510 5816 bytes
SHA-256: c313f2469f72f1b520a0b5ee405a2ff36cd12a646dfaebc91d3ab4ccfe8ea357
font_01_sfnt_off0000e8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CD 10340 bytes
SHA-256: e6b74166f7378aa1c2ae3560a1e84074d3a88cf6b6f135cc47ccfe1a9a3c822b