Malicious PDF — malware analysis report

Static analysis result for SHA-256 638c2884c8c452e3…

MALICIOUS

PDF

79.2 KB Created: 2021-04-08 19:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: e1ed6799128d88ec884ba328a22a27fe SHA-1: af9fdcbef4f8b52ac0f01fc236db433a244c7702 SHA-256: 638c2884c8c452e320c227b66a9916a24eebabcb8c58c7e4498cde0fbafbd195
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as a link farm, containing a large number of external links to various websites. The ClamAV detection and ML classifier further indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of numerous external links suggests an attempt to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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://kuzutuzo.ru/strik?utm_term=john+michael+talbot+communion+song+lyrics PDF link annotation
    • https://cdn.sqhk.co/fakupavod/gigh1hg/stadia_pro_games_september.pdfIn PDF document text
    • https://dojoxokixen.weebly.com/uploads/1/3/4/8/134878929/kezaxulev_safakunirifo_bupumuluma.pdfIn PDF document text
    • https://migawonakizize.weebly.com/uploads/1/3/1/6/131637147/9802dc1baff9b.pdfIn PDF document text
    • http://kyponnik.online/literature_review_table_template232e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459478/normal_6014f870d7f09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404987/normal_60463eeb241bc.pdfIn PDF document text
    • https://berekiba.weebly.com/uploads/1/3/1/4/131482976/7793492.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368747/normal_605b24eca7b8b.pdfIn PDF document text
    • http://podarokinsta.site/bmobile_prepaid_plans0wi7s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404755/normal_60074c10a806d.pdfIn PDF document text
    • https://cdn.sqhk.co/janezewufaj/gjzieSc/shadow_galaxy_live_wallpaper_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/zarejesorufo/JihRCic/9321663213.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369163/normal_5fc7b9f49db7c.pdfIn PDF document text
    • http://nuxavifolezew.22web.org/xared.pdfIn PDF document text
    • http://baltika-trans.com/susasumatufifuzawegnduy.pdfIn PDF document text
    • http://nadahul.ru/jebajosedigowatidowojijnsstz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_8e14f8086110475d8011e9a615565609.pdf?index=trueIn PDF document text
    • https://6776ac3f-883f-499f-bc52-38dff818ec46.filesusr.com/ugd/969751_9010344106d24365a1e0d4110e21bc50.pdf?index=trueIn PDF document text
    • http://fexotupakel.rf.gd/56954318842.pdfIn PDF document text
    • http://poxarow.epizy.com/57038015471.pdfIn PDF document text
    • http://bibijovefuvak.epizy.com/zubalunijavogoz.pdfIn PDF document text
    • https://911f1565-2faa-4874-b261-330d521e7362.filesusr.com/ugd/f46427_b73a0a5fc4f44e1591faab831dcea36c.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE818 5324 bytes
SHA-256: 965ec0cee86bd8c27843633d6a95ab4649934b706826648dc7055013f12512ca
font_01_sfnt_off0000f9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FD 11480 bytes
SHA-256: 8394324d1d12d1e03f86908b792c8baeb0e669f79d7a1ce4726c629e04db876e
font_02_sfnt_off000120ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EF 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361