Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f5e3af3c2928e9d…

MALICIOUS

PDF

82.2 KB Created: 2021-03-10 00:16:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: d7cac17b1d3bdb751703b1ddadcb5bec SHA-1: 55b3ea2df66f1dd7f416a8d8e23d0b09f60bbbb0 SHA-256: 2f5e3af3c2928e9d007d05823d5e57ce662bce6a382c330a3ef5a8d7997d8d57
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. Many of these links point to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/award?keyword=bsc+2nd+year+maths+book+pdf+2020 PDF link annotation
    • http://lnstagramverifiedbadgeshelpcenters.net/67298506531zjg65.pdfIn PDF document text
    • http://repair-kompov.ru/zokozepegumaposusugufv4ulp.pdfIn PDF document text
    • https://topifovav.weebly.com/uploads/1/3/4/5/134595147/vodunemafaw.pdfIn PDF document text
    • http://wiruribadusa.iblogger.org/arabic_remix_video_songs_free.pdfIn PDF document text
    • http://honey-love.ru/plastic_bottle_house_constructionqcijo.pdfIn PDF document text
    • http://vusejulene.iblogger.org/73624022196.pdfIn PDF document text
    • https://lomodujumozib.weebly.com/uploads/1/3/4/5/134588848/8443926.pdfIn PDF document text
    • https://wilibuluso.weebly.com/uploads/1/3/6/0/136086636/besidiludu_kawozerasotul_gedazobudebune_fofose.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_07ca4dba127e4bb78eb0ecb1b1664d37.pdf?index=trueIn PDF document text
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_44f49c41740c48cf9f79931d6bdb4abc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/730b673a-c863-41b5-824d-df68e592edfe/why_would_a_dryer_make_a_loud_squealing_noise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4a1be38-6097-435d-8455-9c0c6b704a20/15966628846.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edddc8b2-b82c-4efb-ae71-ac64444d8005/90408744399.pdfIn PDF document text
    • http://kixelekiteduxaz.rf.gd/47799853534.pdfIn PDF document text
    • http://dexifuv.epizy.com/vogomawojugomurozafagopi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63786738-f251-4b7e-a85e-e4de2da7f035/gexanizarodoxulezeno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/889087bf-1cea-4385-a340-931b5ce039d7/nanojixoxazafa.pdfIn PDF document text
    • https://d09251a9-b09e-4077-8ccb-24037f005f7b.filesusr.com/ugd/a6ce17_5568980180e844a2a7bbba79ab21397c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3809fa2a-f041-4adf-82ea-6a6b772d5ca0/autocad_web_app_not_loading.pdfIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_67b0230179f743a3a248282bb6964563.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61F 6744 bytes
SHA-256: 127b44c9f93874c96d25eb7ddc4688780d8877ce931cf296363fb5748d8d514b
font_01_sfnt_off0000f706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF706 5992 bytes
SHA-256: ae51928d60d61898c1f7078efeaadb55417814537b6acd446f97284a1bd43606
font_02_sfnt_off00010b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B47 2088 bytes
SHA-256: 2af49b0b06a48d84c948bbdf85954c05318e694052949b5316a3f5aa130a28a9
font_03_sfnt_off0001154f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154F 10408 bytes
SHA-256: 8c502fa6cb85e606457e6da3cacd38cf12d6d6914de7873b8a223d383ff38963

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