Malicious PDF — malware analysis report

Static analysis result for SHA-256 313fe088af40ace9…

MALICIOUS

PDF

82.5 KB Created: 2021-04-04 10:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 575e1ee99bb7694888d1ef73ede8ff51 SHA-1: d3e3c57e24a5285d9cbedf46bfa8a5e64faaec2b SHA-256: 313fe088af40ace9ab077ae34144fb357434b8db817b12ea03bc9cabbb28ca88
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links pointing to various domains, many of which appear to be disposable hosting. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external link farm, and 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the use of disposable hosting. The presence of a URL with a 'utm_term' parameter suggests a phishing or redirection attempt. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://fokemale.ru/strik?utm_term=how+to+say+ti+amo PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411250/normal_60479ba7ce122.pdfIn PDF document text
    • https://tirawinuzupufe.weebly.com/uploads/1/3/4/4/134445233/mireposel.pdfIn PDF document text
    • https://pepomujotopulog.weebly.com/uploads/1/3/4/8/134873529/2438539.pdfIn PDF document text
    • http://homiak.fun/the_adventures_of_sherlock_holmes_summary6nv4r.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464078/normal_5fe1633f88af9.pdfIn PDF document text
    • http://naturebiolog.fun/foroxosaxoxilituzeferenefn8j.pdfIn PDF document text
    • http://golosa-spasibo.ru/78491677021r1d84.pdfIn PDF document text
    • https://pudagabofozeru.weebly.com/uploads/1/3/4/3/134333597/4b3cf2e269.pdfIn PDF document text
    • https://zikotidule.weebly.com/uploads/1/3/4/6/134604350/sikepomilutezo.pdfIn PDF document text
    • http://ilkertr.shop/norton_antivirus_free_software_windows_7nhkko.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496571/normal_5fffb91ecd98b.pdfIn PDF document text
    • http://sivelural.mygamesonline.org/tratamiento_farmacologico_de_la_trombosis_venosa_profunda.pdfIn PDF document text
    • http://jokojujut.medianewsonline.com/executive_assistant_job_description.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_ba534771ba4445a495317fe2eac8dc2b.pdf?index=trueIn PDF document text
    • https://edcb5511-827b-40b0-97c1-3499c313f96b.filesusr.com/ugd/0779a3_70ade556f98c4b5caff17e307f238092.pdf?index=trueIn PDF document text
    • https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_07a61440099d4b4caa02e19eb3200038.pdf?index=trueIn PDF document text
    • https://3f3b26af-a357-4ab7-b723-baa2d0f6bb2b.filesusr.com/ugd/5d6e2e_d273859c686d40afb8ac7d41dbfc6283.pdf?index=trueIn PDF document text
    • http://pekafujojef.onlinewebshop.net/60522471535.pdfIn PDF document text
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_2fca797d08104078ad8244106e4ef760.pdf?index=trueIn PDF document text
    • http://gukutimaguvuzum.onlinewebshop.net/62683209293.pdfIn PDF document text
    • https://c18d7360-3707-4bf1-9d6f-52ba7510fa17.filesusr.com/ugd/76cb06_e4fe0d5b6a8542848e613fbf1d252fdc.pdf?index=trueIn PDF document text
    • http://naxesabefadufu.atwebpages.com/new_headway_beginner_workbook_free_download.pdfIn PDF document text
    • https://49b821e7-ee7e-41b4-809b-d0417b8c1ddf.filesusr.com/ugd/927743_90aa4832b3704b678c87f623f1259741.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001041a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041A 4856 bytes
SHA-256: 2a6e55844d6d82595de09ddf2945d07030414d196a97d3b77a1e939062917c00
font_01_sfnt_off000114a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A5 11712 bytes
SHA-256: aae4eee58731b0999af8d945b0393a84f8e421debe4c59cdd20dede04abfce22