Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b0530b073f0af1c…

MALICIOUS

PDF

76.9 KB Created: 2021-06-09 15:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c1d7ace685b7bb6275548245ad8081eb SHA-1: 4bdb2de280e7d170f2aa85768ecd444c25689fb9 SHA-256: 6b0530b073f0af1c0934e0ed98545547730dea2b3d77e8f347aa4f966ef2d43d
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs are likely used to redirect users to malicious sites or download further payloads.

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
  • 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://huntic.ru/pbw?utm_term=best+time+to+check+transmission+fluid PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4482219/normal_5fee9a812a23c.pdfIn PDF document text
    • https://zigaxedalinuj.weebly.com/uploads/1/3/4/0/134016671/lujokubewejita-lelawez.pdfIn PDF document text
    • https://majurunonixo.weebly.com/uploads/1/3/1/0/131070356/9829376.pdfIn PDF document text
    • https://bebibamo.weebly.com/uploads/1/3/1/4/131438385/nugunalageka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457573/normal_6038e43b26f93.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367302/normal_600639195c439.pdfIn PDF document text
    • https://sebeguresed.weebly.com/uploads/1/3/5/9/135966133/nodupeg_pogomu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488103/normal_6002366f4eeca.pdfIn PDF document text
    • https://wetegawufuju.weebly.com/uploads/1/3/5/3/135302163/kipimuwodaxeped.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459027/normal_6007b3f613267.pdfIn PDF document text
    • https://vafumuwolefuz.weebly.com/uploads/1/3/5/3/135325426/6ea44.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://uploads.strikinglycdn.com/files/db9c5e22-41b6-4cd2-91c2-420707a69169/the_ruin_book_ending_explained.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/708c3085-8e34-4051-90d9-5ead59a089cf/86414991971.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b15921ac-5800-4a2b-9f34-20d157e74d1b/serre_des_3_moulins_recrutement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/907bcd98-05be-4aca-b1e9-e324327155b1/kutumedoso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8e19897-7808-493d-bc94-1e1bcf79413b/web_browser_smart_tv_samsung_lento.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cecb1645-5aab-4350-9b06-dcc1a095ee73/suxigupanego.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13586005-cd04-4c51-9aff-d7aefccb23eb/58567779623.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a53f50d-d986-4ef3-bc37-b225330ecca7/beckers_world_of_the_cell.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21ba6f94-f948-4655-b879-32a4f2dd3d76/63131299887.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_off0000e19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19E 5256 bytes
SHA-256: 4d508038788ff8458a9075f3174f3bb0ac3c63d0daaa9ddbb76d32541f4aa030
font_01_sfnt_off0000f353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF353 11020 bytes
SHA-256: 31ca7de8b8f2a9f1a7c056b566f27802cc44e077c75ad3ce3417631696936cb4
font_02_sfnt_off0001181f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181F 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378