Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa4eccc8844cefa…

MALICIOUS

PDF

77.1 KB Created: 2021-05-10 18:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ea4abf6b68d1b9510e090c7a95cc4a32 SHA-1: 736a8d33fc9e8ba360e0008a0cfe357c97cb770a SHA-256: 9fa4eccc8844cefa0eae6d55b207bab095f22dd9c601565d2ce015f8bc22ee1f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with 30 distinct links identified, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/strik?utm_term=ethane+boiling+point PDF link annotation
    • https://cdn.sqhk.co/lenufetimop/bBtid2u/wordscapes_uncrossed_cheat_sheet.pdfIn PDF document text
    • https://tamunalu.weebly.com/uploads/1/3/3/9/133999965/gemuw-vokuwalodud-vubogike-pigivulugosu.pdfIn PDF document text
    • https://meronikam.weebly.com/uploads/1/3/4/7/134705372/vabewifina-daxiwejewufo.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/hiejigd/stickman_and_gun2_mod_apk_latest_version.pdfIn PDF document text
    • https://cdn.sqhk.co/naxupowu/6AjdidP/vawawamam.pdfIn PDF document text
    • https://bujovuve.weebly.com/uploads/1/3/0/7/130738596/daduju.pdfIn PDF document text
    • https://naxetiluwe.weebly.com/uploads/1/3/1/4/131483002/worimegige.pdfIn PDF document text
    • http://jijoxep.getenjoyment.net/lojurazeveruxotonedik.pdfIn PDF document text
    • https://cdn.sqhk.co/nobukomorur/WYg1ljc/any_water_parks_open_in_new_jersey.pdfIn PDF document text
    • https://dogusomuribe.weebly.com/uploads/1/3/0/8/130814063/mivewaxadunigu.pdfIn PDF document text
    • http://kigirifaduguv.getenjoyment.net/5865143846.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/j2hgwge/lolimerorok.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://uploads.strikinglycdn.com/files/a59c9ace-3b0d-4dbc-9a47-1e087f5ee22f/mumegunadekovokat.pdfIn PDF document text
    • https://e06e8306-d71e-4c92-aa1b-e8c52eeb44cb.filesusr.com/ugd/bc4951_864888b9042647c89eb63c920e4bce0d.pdf?index=trueIn PDF document text
    • https://0443db59-9f9d-4031-b786-8a5723798135.filesusr.com/ugd/ab62d6_6ed94cd4a846463dac95284928305d5e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbbcfbc4-6802-49d1-acf8-789c7f32414a/mogonunenivox.pdfIn PDF document text
    • http://gevejonitu.onlinewebshop.net/tovolutebidosaredos.pdfIn PDF document text
    • https://235a1a37-2bc9-4d3b-8f1d-d3952ad9fba8.filesusr.com/ugd/3111f7_ee856c96d18c4dd7b27ed6d3417fdd1f.pdf?index=trueIn PDF document text
    • http://kutoxinupuroxo.onlinewebshop.net/honeywell_thermostat_focuspro_6000_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48891af8-a776-497f-b845-ab2813e8dd15/1852028394.pdfIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_1b2d035b2d314499b1318e9f61f6181a.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_off0000e5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F7 4692 bytes
SHA-256: 4fe2fb715e8fad83e5f073355defff3a65a33e2b0862ec1b3068a5af76e5e0b1
font_01_sfnt_off0000f5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DF 10288 bytes
SHA-256: 2ac29d9b3464f430ace7ecf1d3193907e0a8766bd8f99671d608518c14fea698
font_02_sfnt_off00011936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11936 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2