Malicious PDF — malware analysis report

Static analysis result for SHA-256 d299c90ac50e60b3…

MALICIOUS

PDF

117.4 KB Created: 2021-03-15 14:03:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 7166c7e69a1aa63c5aba80f5d0f3886a SHA-1: 45860f94b246911191da1e8297ae04afb9007ba1 SHA-256: d299c90ac50e60b308ed207ed4d3fd1e7073abddf1bd056a2c9efd5cdf9136f3
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm designed to direct users to external websites, with one URL containing a 'utm_term' parameter suggesting a phishing or marketing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via the linked content. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/123?utm_term=walden+asset+management+impact+report PDF link annotation
    • https://cdn.sqhk.co/fekesolip/hiRigYc/wapilanuxuzu.pdfIn PDF document text
    • https://cdn.sqhk.co/tikalijit/htjhjc5/82363187577.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/ifdiaOI/xopan.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/Wgnjj6Y/susosunebufub.pdfIn PDF document text
    • https://cdn.sqhk.co/xumirikebixo/hf7Sgtp/89685368544.pdfIn PDF document text
    • https://cdn.sqhk.co/joremeve/IaUIgil/cartoon_animation_video_maker_software_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tabewinudeka/gcjbrhd/76753821592.pdfIn PDF document text
    • https://cdn.sqhk.co/wazilisiko/1jgii6i/96219502883.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f6142301-0c02-44dd-b2c5-62cf9b3cd0dc.filesusr.com/ugd/ebfdba_197c4ffaa01e4d00ae6674376ab3fa1c.pdf?index=trueIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_827d35c20c7943f0bdef6fb6dea69970.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/76899399383.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/juvenile_idiopathic_arthritis_adalah.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/project_finance_tracker_template_excel.pdfIn PDF document text
    • https://7fca5364-97a1-4441-b76e-d2c429a59218.filesusr.com/ugd/735424_8cf00f79d7a84946895937660ad32afe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/brachypelma_hamorii_care_sheet.pdfIn PDF document text
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_96761d0f6f84445fa7ab5553c326a9ba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zewimu/gcov_c_templates.pdfIn PDF document text
    • https://7893bdd6-41e4-48f6-9953-3a636dfb5d61.filesusr.com/ugd/c5c63b_dd1b8991357940c1bc8f1f9d5268b4a8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/algebra_1_unit_5_test_systems_of_equations_and_inequalities_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/futamo/aday_retmen_kitap_okuma_formu.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/vukikoxanenabisofudu.pdfIn PDF document text
    • https://ef4b221f-cfb4-47e8-bf1d-3b5092770df7.filesusr.com/ugd/4948da_5f2dccb34d0241a79307601d2b3b53a4.pdf?index=trueIn PDF document text
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_0f79dfc09fd24fe8a018a06167defa10.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_off00018bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BFE 5404 bytes
SHA-256: 1e6b0a2c1623b5073d5c203551c7cd7c2fb5e2190277e0747c128e957bfef37b
font_01_sfnt_off00019e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E55 12528 bytes
SHA-256: 0f1c7c5650a1e6ebc8f6215c7b8242ad63eb8037ce0787a9bb91f174c546f292