Malicious PDF — malware analysis report

Static analysis result for SHA-256 923c526234423a91…

MALICIOUS

PDF

88.7 KB Created: 2021-03-09 04:46:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b75aab5059b66d85ca1328e77b799205 SHA-1: 25e2d81fdc65769bcd021a25f42a5894b7dba396 SHA-256: 923c526234423a9100639311e8b38ee24dd631336636750c5de5f5c11a747e16
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 designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the link farm and the PDF's structure suggest it's intended to exploit users by directing them to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://mezovuduw.ru/award?keyword=jeffrey+archer+quiver+full+of+arrows+pdf PDF link annotation
    • https://sinuxogutit.weebly.com/uploads/1/3/4/5/134505158/zefaloge_fameke_jubulisob.pdfIn PDF document text
    • https://lefamadagizid.weebly.com/uploads/1/3/4/7/134704745/2064722.pdfIn PDF document text
    • https://cdn.sqhk.co/nesorosuxim/cBzMSr9/mepamekifiwoxokimasivowu.pdfIn PDF document text
    • https://papuxivosep.weebly.com/uploads/1/3/4/4/134491017/mobipawik.pdfIn PDF document text
    • https://cdn.sqhk.co/giwitosak/jtZVR6f/kutipi.pdfIn PDF document text
    • https://xefujalebide.weebly.com/uploads/1/3/2/6/132681694/73b512a874b.pdfIn PDF document text
    • https://waperimawomexav.weebly.com/uploads/1/3/4/7/134733778/4958730.pdfIn PDF document text
    • https://rodamopuxex.weebly.com/uploads/1/3/4/3/134354351/84d217f93c3c.pdfIn PDF document text
    • https://jovinafunen.weebly.com/uploads/1/3/2/6/132695325/fofovod.pdfIn PDF document text
    • https://woziwapimarezex.weebly.com/uploads/1/3/5/4/135400795/zamexa.pdfIn PDF document text
    • https://cdn.sqhk.co/bimolixumotu/jgijigj/zelux.pdfIn PDF document text
    • https://jatitebomotopoz.weebly.com/uploads/1/3/0/7/130776336/zalofadesirunagefo.pdfIn PDF document text
    • http://fepotarugagi.22web.org/90069485885.pdfIn PDF document text
    • https://kigatuxusim.weebly.com/uploads/1/3/5/3/135305206/fufefa-kafabibo-limomapu-mubinigaz.pdfIn PDF document text
    • https://numilobes.weebly.com/uploads/1/3/4/2/134235742/wudowoz-joxuvegisen-vesezit.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/jiicE75/dipson_theaters_mckinley_mall_hamburg_new_york.pdfIn PDF document text
    • https://vefurubaturuxal.weebly.com/uploads/1/3/0/7/130739777/jature_xalidojag_fibevix_wopodax.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/fb3d954c-e172-496e-b3cd-0baec630099d/poposajejedaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57ee7970-bd72-4cb8-891a-e9607f8b56ea/how_to_turn_on_night_owl_dvr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd8e5f17-e1e8-4a48-8968-b18cfeaa8a5f/ford_mustang_2.3_ecoboost_0-60.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b27c86d4-70e1-4bec-a72c-bbf65a4a6801/gesevixisegofixiruwikibux.pdfIn PDF document text
    • http://romufadi.epizy.com/what_is_an_example_of_pragmatic_theory_of_truth.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_off00011104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11104 5308 bytes
SHA-256: dab329e41c71494d8661c76008d5b348e47050da8357b60106b35224ef432ef6
font_01_sfnt_off00012340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12340 10476 bytes
SHA-256: 50ed2ea7a232ebb44324cd156a07a40edb3766b59730eef3c0f0af90bf3c9d10
font_02_sfnt_off000146e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146E6 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333