Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4363703eb2bd04b…

MALICIOUS

PDF

100.8 KB Created: 2021-05-03 01:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 6291e2d53e454ff3a0bc40d46ea09a70 SHA-1: 00a00d1c1e140535722ef7714aa2df45d9a129e6 SHA-256: e4363703eb2bd04b23fd4a8e44806041a0b9be78c098d10e561beb260c3bf187
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirector infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a link to 'dafemum.ru' as malicious. The ML classifier also strongly indicates maliciousness. While no scripts were extracted, the document's structure and embedded links suggest a phishing or malware distribution attempt, likely delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 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://dafemum.ru/strik?utm_term=does+the+feng+shui+bracelet+really+work In PDF document text
    • http://dawuxapi.iblogger.org/68585661521.pdfIn PDF document text
    • http://sk-anker.ru/269786636823bvjn.pdfIn PDF document text
    • http://kmplitka.shop/beruzisabu35bf8.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://tujurexi.weebly.com/uploads/1/3/4/7/134743655/9188620.pdfIn PDF document text
    • http://voirly.xyz/98443492369q0jli.pdfIn PDF document text
    • https://zoxaminajoge.weebly.com/uploads/1/3/1/6/131637873/wonirowebenaxob_wagopesixofivak_rabodujasoj_sibigekezupej.pdfIn PDF document text
    • https://waxosutuj.weebly.com/uploads/1/3/1/4/131437699/bivesawulo_bemuxofasi_metikol_gijevubok.pdfIn PDF document text
    • https://jibidamo.weebly.com/uploads/1/3/5/3/135337573/154c8b88a8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wozurusezop.rf.gd/omnisphere_2_presets_list.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/38703081548.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/functional_specification_requirements_templates.pdfIn PDF document text
    • http://rexalovujomorox.epizy.com/allegra_180_bula.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/black_and_decker_coffee_machine_manual.pdfIn PDF document text
    • http://mexorilurolepap.rf.gd/elephant_raymond_carver_quotes.pdfIn PDF document text
    • https://6b5d12f1-3bbc-48af-9ddb-5430d2fe15e7.filesusr.com/ugd/3bf302_2c35905154bf49adabf3ae43b3a54d99.pdf?index=trueIn PDF document text
    • https://28a90398-13b1-4b58-b54c-ed045a6bddf2.filesusr.com/ugd/7e9e1f_4cea610966a6492f8114fbc9b024fecb.pdf?index=trueIn PDF document text
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_f926ffecb902440a8f4d289a0058bf41.pdf?index=trueIn PDF document text
    • http://somizifiwij.epizy.com/savid.pdfIn PDF document text
    • https://e18e6c05-101e-4f41-9c4d-f518aea09dbb.filesusr.com/ugd/7972b3_be6dca1c980a40d6aa55c53c46c8ebc5.pdf?index=trueIn PDF document text
    • https://27158da8-170d-48ca-a528-b8ced62fe517.filesusr.com/ugd/9fc8c3_7e08618ec68243ca810b85dec7246f57.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_off00013d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D66 2900 bytes
SHA-256: 40ce0bc9b113ef031639604f059b60aa9f1e41b097d60e75bfbf620cccc66306
font_01_sfnt_off000147aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147AA 5540 bytes
SHA-256: 9f891fea1729e2898bd6b3b1ce8f749e9f9f0954e9e091e253a7b9d64cef0566
font_02_sfnt_off00015aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AA4 12484 bytes
SHA-256: fe830b9a3aa380a227ffc26996543e1eb2d487fa95fb05aafbce93db26352a95