Malicious PDF — malware analysis report

Static analysis result for SHA-256 d089948fb90ca53b…

MALICIOUS

PDF

114.0 KB Created: 2021-05-28 04:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 179bcf39e2085a6efc33d4c582dcb19e SHA-1: 237498530241b8e83542ad0bda5fe7be719c113b SHA-256: d089948fb90ca53b76ce1b0952f289c852d3b9be444cb7c92394ef370dc8dc1b
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting and redirect to malicious sites, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The primary malicious URL identified is 'https://yafferge.ru/strik?utm_term=how+to+write+a+college+essay+about+myself', which is likely used for phishing or malware distribution. The ML classifier and ClamAV detection further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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://yafferge.ru/strik?utm_term=how+to+write+a+college+essay+about+myself In PDF document text
    • https://gojolukok.weebly.com/uploads/1/3/4/4/134455450/lobumadukevazezevi.pdfIn PDF document text
    • https://fapovodulutob.weebly.com/uploads/1/3/4/3/134361236/74b4945a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446034/normal_5ffbdd0dd0b35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408177/normal_602b3e9eb7059.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495387/normal_5fdd766d3cb06.pdfIn PDF document text
    • https://gesogakit.weebly.com/uploads/1/3/4/5/134581759/274881.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450430/normal_605f56c91d98f.pdfIn PDF document text
    • https://ridakikasidom.weebly.com/uploads/1/3/0/7/130739592/nimunizu-bipewedebuxi.pdfIn PDF document text
    • https://toguxobuse.weebly.com/uploads/1/3/4/9/134902292/wadagiwinunore_gosijemamofixo.pdfIn PDF document text
    • https://pifavakibapel.weebly.com/uploads/1/3/0/8/130814246/5596763.pdfIn PDF document text
    • https://figedojopijobe.weebly.com/uploads/1/3/4/7/134769561/dubiravim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461744/normal_60109e5933183.pdfIn PDF document text
    • https://wegetifadozapuf.weebly.com/uploads/1/3/1/6/131637062/4b1385c32e7.pdfIn PDF document text
    • https://luvupomadimudux.weebly.com/uploads/1/3/4/3/134350134/xibusukoxif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/52bcbd69-2027-42ae-b0f5-9271cfd2d386/suruduzekadujowuvopive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cb00a2b-0cb0-4b54-8dd9-6f8954370f37/14445980207.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bdbd5a3-bac9-4237-8aa4-affcbf52e088/ruger_lcp_lasermax_battery_change.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb63d9ae-bf90-4809-8d7b-4c04615286bd/pakefukugelo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f76f643-72f7-4171-bb03-ec7809835ffa/ejercicios_de_comprension_lectora_segundo_basico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f5dcb17-87b1-4438-b711-114b2aa4dd18/civil_engineering_materials_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9273975-4db7-4e3f-8cc1-21762fbdca4e/32619052225.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98adc30e-c43b-4b03-a67a-6b8e43e90b9c/ximev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6544a868-e992-48ed-b327-08cb3257cfb5/how_to_change_keurig_water_filter_k200.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_off00018297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18297 5496 bytes
SHA-256: ed1c5c178cec98317214146947782c27ef4cfdb26d9b8bc957f4bd7851fe29ec
font_01_sfnt_off0001954a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1954A 10752 bytes
SHA-256: 184bb0f5154f4a91fe9b131a16324551f361478db898ccf1b960215359dc08f5