Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac71c10b0f24352…

MALICIOUS

PDF

79.5 KB Created: 2021-03-24 01:41:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 31feb9af75dbaee93e77c7c5310bcb43 SHA-1: 9d080c3e1c1891782ad2e3c21b20becf6d1c8728 SHA-256: 8ac71c10b0f24352c7bf4b34ab750c6628739bfcfa2909f584b0cfa1a68bda01
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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://mezovuduw.ru/strik?utm_term=how+do+i+reset+my+night+owl+wireless+camera PDF link annotation
    • https://zatibuvox.weebly.com/uploads/1/3/0/7/130738619/judis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393369/normal_5fd0e5ab69fd3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481539/normal_5fe3738b50a92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368240/normal_5fdb5862c7b0f.pdfIn PDF document text
    • https://leresidatebij.weebly.com/uploads/1/3/0/7/130776374/8792634.pdfIn PDF document text
    • https://severuzilun.weebly.com/uploads/1/3/4/7/134710190/kopuvadek-wixokowudege-ritirekuwil-fimanedapum.pdfIn PDF document text
    • https://fodolirikixubug.weebly.com/uploads/1/3/5/2/135297927/vimozuvaxexafozuxij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449185/normal_6024516ce54bf.pdfIn PDF document text
    • https://bemetezebore.weebly.com/uploads/1/3/4/8/134882820/gekewawafidefaj-sodifezedi-bijavi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405904/normal_5fe418d05b58d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484815/normal_6007ff2879967.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426699/normal_5fd934f1dad2c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492897/normal_600244b37c080.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420764/normal_600af5038c2cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407316/normal_5fc7d1e86d390.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://s3.amazonaws.com/fulazelof/avg_for_windows_10_free_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11915333-6afe-4ce7-98f9-db489ed0a672/canon_pixma_ip90v_driver_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6a0709d-feb5-44a1-867c-9f813b26c9bb/real_analysis_krishna_series_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/158a7069-4a3b-4e64-8bf7-ed825351db14/96439324580.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/aaruthra_movie_video_songs_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbfe6a40-de89-402f-9f0e-6ae0944a072d/ninja_smoothie_blender_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e9916d9-4975-4383-9a33-8d9ff985cc5e/11925890996.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/32378872498.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/491f4811-1e23-45c6-8c65-af9b76a03004/multivariate_gaussian_anomaly_detection_python.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_off0000ea8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8D 5296 bytes
SHA-256: 446eecd9d89cc4d0577ba9666c12ee387a308ae9012adca735a59979b932be70
font_01_sfnt_off0000fc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6E 11012 bytes
SHA-256: 8f5f182e9bace6a6c919c740f25095451ca40feadaea75a2fb2e22114eed2591
font_02_sfnt_off00012215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12215 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2