Malicious PDF — malware analysis report

Static analysis result for SHA-256 8394ab7a9cef9845…

MALICIOUS

PDF

76.6 KB Created: 2021-05-23 02:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6121050558f16b2fd001283d3011a895 SHA-1: e523a7ab82e9e1f6a5a2a691156d490e41e20a48 SHA-256: 8394ab7a9cef984539dff00ad060f9b3ac8a8a3c738e32a8a593d509f1367ca1
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, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://zajinet.ru/strik?utm_term=2015+bls+student+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413225/normal_5fd2acb59c8fd.pdfIn PDF document text
    • https://desebenenoda.weebly.com/uploads/1/3/5/3/135348916/2257447.pdfIn PDF document text
    • https://pubedazemel.weebly.com/uploads/1/3/4/8/134870130/wetamugesuvunu.pdfIn PDF document text
    • https://wasizizinawuj.weebly.com/uploads/1/3/6/0/136096362/fosabex.pdfIn PDF document text
    • https://xipejefokodidub.weebly.com/uploads/1/3/4/6/134612454/b440bf5358cb43.pdfIn PDF document text
    • https://kiwaluraxipexe.weebly.com/uploads/1/3/5/3/135326690/8e0d581dd34.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/2f012ad859.pdfIn PDF document text
    • https://gazapaxinu.weebly.com/uploads/1/3/4/4/134475358/79def9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495039/normal_5fd28c690ef01.pdfIn PDF document text
    • https://wufipalowev.weebly.com/uploads/1/3/4/5/134595621/nunusi.pdfIn PDF document text
    • https://xaxazusilu.weebly.com/uploads/1/3/4/7/134757455/dorobuwev-wadexixi-tujesawisaku.pdfIn PDF document text
    • https://welavofewefose.weebly.com/uploads/1/3/0/8/130813025/fc4a7e34ad9.pdfIn PDF document text
    • https://suxekupawuva.weebly.com/uploads/1/3/2/7/132710704/8038162.pdfIn PDF document text
    • https://xamegazu.weebly.com/uploads/1/3/4/4/134440804/2532368.pdfIn PDF document text
    • https://dujakoxuk.weebly.com/uploads/1/3/1/4/131483447/3730853.pdfIn PDF document text
    • https://mipukijomov.weebly.com/uploads/1/3/4/7/134768852/5b3d3a6f6f9136.pdfIn PDF document text
    • https://xakowuval.weebly.com/uploads/1/3/5/3/135316831/6278169.pdfIn PDF document text
    • https://kivasemav.weebly.com/uploads/1/3/2/6/132680863/ba9cced2.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/e36f7960-2df0-4c7b-a94b-ad3e6669dfc8/86482957992.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/590e362b-0c16-4659-93bf-72beba62c21a/pewomipodunowikiximijevoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80d5feea-c744-422f-a85d-0cd03f7d5ee4/gagotitubofuremaburonefod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9b856b0-708f-4dc3-beb1-2ea89fdd6405/why_promote_diversity_and_inclusion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7257132a-1c78-4174-b5a4-0172ec955979/novela_de_rafael_orozco_el_idolo_capitulo_49.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_off0000e09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09E 5312 bytes
SHA-256: bb15138ce251e1c5c266aed9bc04b4f28750353077e4cf957cb2018dac070785
font_01_sfnt_off0000f288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF288 10544 bytes
SHA-256: 8264d3e5298fab210922386b704200f113d9dcabcbfbd61a927f5273d88ed88a
font_02_sfnt_off000116b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B2 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361