Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5d86daeed02051…

MALICIOUS

PDF

77.5 KB Created: 2021-04-04 05:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: dfd3db4063025de6456db1d2e5b1183c SHA-1: 4458c6a6916c5a87ee38b535ed341a550968cb27 SHA-256: 5b5d86daeed02051b2d1ee3fd66c0829a721408005058c16bf8cf648103802ae
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with many pointing to disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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.
  • 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://leonvi.ru/123?utm_term=ark+survival+evolved+android+game+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456389/normal_601395276721c.pdfIn PDF document text
    • https://deponoma.weebly.com/uploads/1/3/2/6/132696267/4899571.pdfIn PDF document text
    • https://ruritavi.weebly.com/uploads/1/3/3/9/133988031/2998005.pdfIn PDF document text
    • http://copyright-help-report.com/dr_martyn_lloyd_jones_sermons_on_romansfhl16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473632/normal_5fec05360fc18.pdfIn PDF document text
    • http://urolog.xyz/elements_and_principles_of_design_line_definitionzddmg.pdfIn PDF document text
    • https://fogojokiverowur.weebly.com/uploads/1/3/0/9/130969702/zuridipovowusul_sukomogonina_sasazuxorebaf.pdfIn PDF document text
    • http://yachtcharter.group/examples_of_countable_and_uncountable_nouns_in_sentences3kha2.pdfIn PDF document text
    • https://benevegavevu.weebly.com/uploads/1/3/4/5/134501748/293772f8.pdfIn PDF document text
    • https://wobelafesuta.weebly.com/uploads/1/3/4/7/134767333/xovemapeba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381108/normal_6057ee9b7ca29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455370/normal_602e4bf5a3968.pdfIn PDF document text
    • https://pokenavij.weebly.com/uploads/1/3/4/8/134892290/fumenonekofan.pdfIn PDF document text
    • http://womenita.fun/verismo_v_brewer_manual9gfzh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451574/normal_6001d418b7f86.pdfIn PDF document text
    • https://kovibokasekur.weebly.com/uploads/1/3/4/8/134880184/jezajanelabilifiwabu.pdfIn PDF document text
    • https://kepefiporewe.weebly.com/uploads/1/3/4/7/134704647/jetalaxizuwileve.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tezude/pawanabala.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab7bf36b-f3be-4750-97b8-b6cd12298620/wokutinof.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/best_free_sound_enhancer_for_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/rovorejodowisixonize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaa6801c-4fc5-4bc1-9a88-f63ab3df992e/vabaluzumavozadofediz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7919c844-24a6-4126-8d8f-9b7004a13254/the_missing_season_2_episode_2_review.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_off0000f2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BA 5340 bytes
SHA-256: ae198f30fba28a8dfa6964c33f4751f23c27dd84c5fcd30c90e4265fb9adecaa
font_01_sfnt_off000104de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DE 10316 bytes
SHA-256: ab4008c7bee65f69a06dc6320d4f643d4d4918407bbd3849c4c8438666b30be0