Malicious PDF — malware analysis report

Static analysis result for SHA-256 f84d8a17a922009d…

MALICIOUS

PDF

71.4 KB Created: 2021-03-06 16:02:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 47c158a657cf79417bcd54a4d2a45df7 SHA-1: 1ed441d384399c7980f1d80cc07f2aeedb7cbfa0 SHA-256: f84d8a17a922009dbe372c6fff5186d6fb178ec47b46f0b07a8643105fd6d308
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating malicious intent, including PDF_SEO_DISPOSABLE_LINK_FARM and SE_MFA_LURE, suggesting it's part of a phishing campaign. The embedded URL `https://xajibur.ru/award?keyword=how+to+use+ms+excel+basic` and the link farm URL `http://fuvesozufinefi.medianewsonline.com/download_film_fifty_shades_of_grey_2019_sub_indo.pdf` are likely used to redirect users to malicious sites. ClamAV detection further confirms its malicious nature as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://xajibur.ru/award?keyword=how+to+use+ms+excel+basic PDF link annotation
    • http://fuvesozufinefi.medianewsonline.com/download_film_fifty_shades_of_grey_2019_sub_indo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450337/normal_60434c5325443.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426262/normal_601f74ab5518a.pdfIn PDF document text
    • https://cdn.sqhk.co/duwokarewesu/icifYhj/49693155351.pdfIn PDF document text
    • http://ligugiban.scienceontheweb.net/fukelotebofo.pdfIn PDF document text
    • http://nizavevorupuj.mywebcommunity.org/gusipumefoxopuwinexipizir.pdfIn PDF document text
    • https://cdn.sqhk.co/vavewiren/jbShcjW/60301684648.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417815/normal_600bd2a50d718.pdfIn PDF document text
    • https://simisasokudu.weebly.com/uploads/1/3/4/2/134235492/9cc2c.pdfIn PDF document text
    • http://rilomenininun.getenjoyment.net/casio_5081_analog_time_set.pdfIn PDF document text
    • https://rofekituluz.weebly.com/uploads/1/3/2/3/132303072/0c968499d08.pdfIn PDF document text
    • https://sijalafad.weebly.com/uploads/1/3/4/8/134887162/544635.pdfIn PDF document text
    • https://cdn.sqhk.co/kifukuvitog/jb5Nkw6/photo_editing_app_free_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420612/normal_5fd797022bc1e.pdfIn PDF document text
    • http://dikegebe.mygamesonline.org/how_to_improve_sat_reading_history.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pomaxa/types_of_language_in_nepal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae34384a-bbbb-4fa4-bc99-b27410daa1ea/tefuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97237a61-ba5d-44c4-b2b7-38c065b933d7/how_do_i_know_if_a_company_is_publicly_traded.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f04117d8-4ac7-495e-bc7d-0ab585478ea9/womuvurunenenimusaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba5be94a-02f4-4102-ae4a-f7f4a1f30fed/normal_distribution_table_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/sobujivojojepebalofuzon.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_off0000db21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB21 5112 bytes
SHA-256: b7fb0e28c8b6d9614f521a21bdbbc54b92d13526910be9231823038ba6a38533
font_01_sfnt_off0000ec85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC85 10588 bytes
SHA-256: 72a00a8da628f80cb0c7de4a19c26fa52db9d196a4068b868cbc4574b27f8a15