Malicious PDF — malware analysis report

Static analysis result for SHA-256 e36ec1dbbbdb3f19…

MALICIOUS

PDF

85.6 KB Created: 2021-02-18 11:12:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 171b09a4d1f06facebb0c85780e2eb9a SHA-1: 1f24b732b2b3cf98c9f0c8814685fc31df8a017d SHA-256: e36ec1dbbbdb3f19b878f1c9db0bbf030cde28e54ab75fc85b1449d903d6f41d
244 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links pointing to various domains, many of which are hosted on disposable or suspicious infrastructure. Heuristics indicate a link farm designed to redirect users to malicious content, with one URL specifically identified as a known malicious redirector. The presence of these links suggests an attempt to lead users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=captivating+book+criticism In PDF document text
    • http://narelavupes.22web.org/building_maintenance_job_description_template.pdfIn PDF document text
    • https://cdn.sqhk.co/povewepalu/gijjbhh/blood_pressure_by_age_2020.pdfIn PDF document text
    • http://vilopeg.xyz/bararenajon6fwh.pdfIn PDF document text
    • http://nout-prodat.site/sejarah_bandung_lautan_apiwug0g.pdfIn PDF document text
    • https://wikagigodoxuf.weebly.com/uploads/1/3/2/8/132814929/waxunelitawopowez.pdfIn PDF document text
    • http://atlas-copco.su/vosepikuwixazoravdl0.pdfIn PDF document text
    • https://petobaxiteru.weebly.com/uploads/1/3/1/4/131407236/punox-sotimivakizukup.pdfIn PDF document text
    • http://clubstore.info/36332947406ll9nv.pdfIn PDF document text
    • https://cdn.sqhk.co/keserina/a54jggS/munchkin_match_magic_home_building_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/gixejefi/5HEShbr/taboxojamafevab.pdfIn PDF document text
    • https://cdn.sqhk.co/rugofufol/iaTgeid/wamutetilagidogiwivaxegal.pdfIn PDF document text
    • http://espaceabone.com/weed_killer_for_grass9bzxv.pdfIn PDF document text
    • https://cdn.sqhk.co/fovuxugo/Shijd4t/magusawibosonoxasojumabul.pdfIn PDF document text
    • http://waystep.site/executive_summary_internship_report0w3i3.pdfIn PDF document text
    • http://ryursew.space/file_police_report_online_hpdi3xcs.pdfIn PDF document text
    • https://pujeradix.weebly.com/uploads/1/3/2/6/132695809/basedereluvenanutew.pdfIn PDF document text
    • http://bemijaragilez.22web.org/tin_can_manufacturing_process.pdfIn PDF document text
    • https://wikagigodoxuf.weebly.com/uploads/1/3/2/8/132814929/wezaka.pdfIn PDF document text
    • https://cdn.sqhk.co/rifojimuna/fJjezgg/zogibivokirisusetisotoz.pdfIn PDF document text
    • https://cdn.sqhk.co/guwewaxa/b9AHhjh/gifewenunuwudujib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vufagozujidivu.epizy.com/niwomisomafavuvasiwubev.pdfIn PDF document text
    • http://jumuvurerurulap.rf.gd/48910167591.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_off0001136d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136D 5388 bytes
SHA-256: 86c1368299d312e21732e394f8e5610e9c2b9a60c519c8340177c6fa4deb1fe7
font_01_sfnt_off000125b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B6 10392 bytes
SHA-256: 519a5d6808345bd1d1e2127564e057a5994243a674e9f131fcb87a890d618bb2