Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c168953fd730fa1…

MALICIOUS

PDF

109.8 KB Created: 2021-03-28 21:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ff822573081039d0b32ca4f4dcbd1591 SHA-1: 6da00c32f46f14bad84ab1ca3aa83f17991852a7 SHA-256: 0c168953fd730fa1cbf9eb335b446455349cfe5fd382eb358d74e89a23640a94
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://druttle.ru/award?keyword=the+asian+tigers+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409123/normal_603a5c35df14a.pdfIn PDF document text
    • https://degetopej.weebly.com/uploads/1/3/4/7/134727915/vizipux_wewadiz_naregixobosezo_wavukibakiso.pdfIn PDF document text
    • https://cdn.sqhk.co/firavibaw/2hb4Bgc/adversaire_synonyme_6_lettres.pdfIn PDF document text
    • https://zefemebok.weebly.com/uploads/1/3/0/7/130775969/df53e2.pdfIn PDF document text
    • https://funogefoxareso.weebly.com/uploads/1/3/4/0/134041001/fuzad_jerudix_dilivep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467306/normal_60089065e1cbf.pdfIn PDF document text
    • https://cdn.sqhk.co/birenejar/jayFggd/61093117588.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/ZJUvR3z/idea_free_talktime_code_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450723/normal_60263a5bce78b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411001/normal_6016517b2a07f.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxolusufa/jbGhdif/91852187763.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/BIdjbhd/acrylic_nails_near_me_open_today.pdfIn PDF document text
    • https://tudexabi.weebly.com/uploads/1/3/4/7/134770635/tovadufizeposaxobox.pdfIn PDF document text
    • https://cdn.sqhk.co/bodavadu/jLjgPQx/adverbios_en_ingles_ejemplos.pdfIn PDF document text
    • https://cdn.sqhk.co/tavaxiwugo/hieDvge/h_band_app_alternative_deutsch.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://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_b9619c8f83b4493aad0f3e1040baa4da.pdf?index=trueIn PDF document text
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_673c7f0884f04f29b12077f3fd769ee3.pdf?index=trueIn PDF document text
    • https://065b66ee-25d8-4381-b309-094abc4d823c.filesusr.com/ugd/2703e6_467ebea87e9e453e8e682cedd82c7baa.pdf?index=trueIn PDF document text
    • https://104e3d6a-8609-4a5f-ba89-88df40aeb326.filesusr.com/ugd/3cb22f_95222512bec14f1d843be39367025114.pdf?index=trueIn PDF document text
    • https://27158da8-170d-48ca-a528-b8ced62fe517.filesusr.com/ugd/9fc8c3_f5626029e0f24cbfa9741d65300a82c7.pdf?index=trueIn PDF document text
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_dd0ea174295f488e9756ac221208ace2.pdf?index=trueIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_12e894ea605c4df180acc3e34d150603.pdf?index=trueIn PDF document text
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_2551a3b5c451421abda3a76aabc55805.pdf?index=trueIn PDF document text
    • https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_93881f19e01741df94105ee5d9cf1760.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0E 8676 bytes
SHA-256: 78666834328b4c16ce06d9c4de8828f840696f7c9be7889601f0c6236ffef15d
font_01_sfnt_off00015a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A59 5220 bytes
SHA-256: 888984f98f0eaf726cc91b0e4f85d314356413355cb0a0c06e16c76dc8fe94d2
font_02_sfnt_off00016c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C11 4380 bytes
SHA-256: 5b7cfd012d648ac33342a4a37f379afe6b92284107607b9f9b0020ebde885973
font_03_sfnt_off00017bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BF1 14196 bytes
SHA-256: ca554e5b2812315ecae2c4d30ef9ed55e2052ec856d7c9f5a8a399165d0837fd