Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ed3df07d551308c…

MALICIOUS

PDF

83.4 KB Created: 2021-04-26 06:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 28891925e7c1a8bff1ec7b14e01cf775 SHA-1: ce778ae3d9a547540c34e4081bf99570989eba42 SHA-256: 6ed3df07d551308cccddccdef0fcff8cd4470cdf92b277f98ec2d4b0b59b2192
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or the embedding of malicious JavaScript to facilitate the download of further payloads.

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://midufefew.ru/strik?utm_term=quran+in+english+application+download+free PDF link annotation
    • http://bluetea.space/rosulajesubege4dzij.pdfIn PDF document text
    • https://cdn.sqhk.co/sopiloroda/ciid5gc/residential_electrical_wiring_diagram_software.pdfIn PDF document text
    • https://gadakuvinud.weebly.com/uploads/1/3/1/8/131871823/97ab8a39f1c9e6f.pdfIn PDF document text
    • http://vehicleinsusa.com/10036280724qflsf.pdfIn PDF document text
    • https://zubetotuduve.weebly.com/uploads/1/3/5/3/135340520/nijabatesomasono.pdfIn PDF document text
    • https://cdn.sqhk.co/kifavubivelo/d5hi4og/wezidinenoka.pdfIn PDF document text
    • https://cdn.sqhk.co/vedasukuki/zhjqjcz/wrestling_revolution_3d_wwe_2k17_mod_apk_data.pdfIn PDF document text
    • https://rokipidofavum.weebly.com/uploads/1/3/4/0/134042790/31c590e526eef02.pdfIn PDF document text
    • http://zegevuk.22web.org/btinternet_mail_server_settings_android.pdfIn PDF document text
    • https://nekatiru.weebly.com/uploads/1/3/2/6/132695473/1601772.pdfIn PDF document text
    • https://wisutusetuma.weebly.com/uploads/1/3/4/5/134524637/pavibowi_xurug.pdfIn PDF document text
    • http://profaudit32.ru/angka_penting_adalah7wztj.pdfIn PDF document text
    • http://g2am2e.xyz/sony_vpl-hw40es_specificationsiuyna.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://97783159-ced7-426e-9fbd-60d2bb3342fb.filesusr.com/ugd/00058f_5dddb87176e4415086d6ef5dd37c491e.pdf?index=trueIn PDF document text
    • https://2a497570-3881-454f-aefc-229a18bbdf22.filesusr.com/ugd/83e24f_0a826d3b91664656a0350e670a0255ee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lerezazo/66059196168.pdfIn PDF document text
    • http://koxixamenima.rf.gd/personification_definition_and_examples.pdfIn PDF document text
    • http://lifukifeja.epizy.com/vitusudosunizuwonas.pdfIn PDF document text
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_921ef0ff18a145eb819775d06011879e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jakujakula/lananulipukekorigoz.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/fekejesafiperexepaladid.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF953 5452 bytes
SHA-256: 7609144d643ba13e2e73ad739df03c3f0bf441a2ecd78bda92dc926b522caa1e
font_01_sfnt_off00010bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDF 11188 bytes
SHA-256: 3a65516d8698a2fc9bff0f4a6fcb79353b720ae506796a11683757f3842c10e6
font_02_sfnt_off00013208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13208 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3