Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4136381f9702f6…

MALICIOUS

PDF

75.6 KB Created: 2021-03-17 14:42:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6e02610ddd8120d52a196dc90bdf6cf3 SHA-1: ef50069db8d0591407a4dfd2df3aa4a618b57df5 SHA-256: cc4136381f9702f6f05fe2fe07b7a04a44a5411ad975412a89244f872a8bcc99
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of numerous external URIs and the overall structure point towards a malicious document designed to lure users to external resources.

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
  • 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://zajinet.ru/wix?keyword=craftsman+gold+6.75+lawn+mower+parts PDF link annotation
    • https://cdn.sqhk.co/rizonozugaj/hiD4sjb/lazefej.pdfIn PDF document text
    • https://jijaxiwiruba.weebly.com/uploads/1/3/5/3/135333012/1746858.pdfIn PDF document text
    • https://cdn.sqhk.co/kewebogi/hjjdjL8/baburao_bagul_mother.pdfIn PDF document text
    • http://getliterate.online/kubopaduxijija311ap.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzozuni/fc41Irk/flights_to_miami_florida_from_lax.pdfIn PDF document text
    • https://cdn.sqhk.co/josurowelimu/wgdMgjj/ghost_world_comic.pdfIn PDF document text
    • http://pollsexpert.com/60708133207y3fif.pdfIn PDF document text
    • http://streamsweets.com/81837528450pjd7y.pdfIn PDF document text
    • https://borubuzas.weebly.com/uploads/1/3/4/0/134042729/suwekagozemuxuju.pdfIn PDF document text
    • https://cdn.sqhk.co/daladovum/mChaMgd/best_ninja_foodi.pdfIn PDF document text
    • https://jurefuzosapob.weebly.com/uploads/1/3/4/9/134901670/5482107.pdfIn PDF document text
    • https://cdn.sqhk.co/pozazoji/hijerlq/65379741740.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388820/normal_5ff1b2172f6ef.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwifemi/ggBG8Ak/23949064499.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407777/normal_5fce56d3be673.pdfIn PDF document text
    • https://cdn.sqhk.co/wodelaganav/rOhiACm/pepi_hospital_mod_apk_1._0._69.pdfIn PDF document text
    • http://nipizakevenuvis.scienceontheweb.net/fadapos.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/which_vacuum_is_better_shark_or_hoover.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/ECtiaK5/29272288547.pdfIn PDF document text
    • https://fikakexuk.weebly.com/uploads/1/3/0/7/130775276/nudufavikesofix.pdfIn PDF document text
    • https://vizifota.weebly.com/uploads/1/3/0/9/130969876/204e0c58b.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
    • http://fiforeru.atwebpages.com/28529488375.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA22 5604 bytes
SHA-256: 9ae0ba302ce7d2bc0f2bfcf45e16d622577202a1a05253b5e55646d88436733c
font_01_sfnt_off0000ed43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED43 10940 bytes
SHA-256: 7d8260f4d8de43f4dd179086767a6bec4bf0d780f758a664f84515f81757e8c8
font_02_sfnt_off000112aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AA 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361