Malicious PDF — malware analysis report

Static analysis result for SHA-256 78cea8495a3bf4c0…

MALICIOUS

PDF

98.5 KB Created: 2021-05-31 13:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 628b37ee657286608bdeb70730f8a1c1 SHA-1: cb04906af4955f2f176a51fd1c9e4e77289e2a85 SHA-256: 78cea8495a3bf4c0ab6e368aac099033a08975fcf4a2d42299c8f13e4edb2a3d
126 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to various external PDF files, one of which is associated with a Minecraft download lure. The presence of numerous external links and the ML classifier's high confidence score indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URIs suggest a social engineering tactic to drive traffic to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://seumenha.ru/strik?utm_term=minecraft+pe+skyblock+download+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416143/normal_5feee5aa4c5db.pdfIn PDF document text
    • https://girusidopot.weebly.com/uploads/1/3/0/7/130738876/12d30ddf32.pdfIn PDF document text
    • https://vawigaxonisas.weebly.com/uploads/1/3/1/4/131438461/1549277.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411921/normal_605a041f67023.pdfIn PDF document text
    • https://taxubixud.weebly.com/uploads/1/3/4/7/134760406/0a7160f2611d.pdfIn PDF document text
    • https://xogepojofaridel.weebly.com/uploads/1/3/2/7/132741214/musakog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450883/normal_600f74ef469e2.pdfIn PDF document text
    • https://dotaterezisal.weebly.com/uploads/1/3/4/7/134771172/9158835.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477629/normal_605c3f859c434.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407060/normal_60616c5f7cde6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469847/normal_605c2ea7cca9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484115/normal_600b47719ac1b.pdfIn PDF document text
    • https://gakefutafo.weebly.com/uploads/1/3/0/7/130739004/rubagikag_lupuwawomepafef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451737/normal_6023c87a91611.pdfIn PDF document text
    • https://dijitisabotiji.weebly.com/uploads/1/3/5/3/135324222/mifepago-mobirozigi-betigisidim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475852/normal_603125b992b86.pdfIn PDF document text
    • https://zogefiwodojur.weebly.com/uploads/1/3/4/3/134310711/miwonamamekipefiruw.pdfIn PDF document text
    • https://fizetisiwukuz.weebly.com/uploads/1/3/4/3/134339589/losuga.pdfIn PDF document text
    • https://funosojo.weebly.com/uploads/1/3/5/3/135336125/102cb7b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/69a5ede6-6b8b-4cc5-99cd-76ae9251f93e/61630848998.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14ee4140-c0f1-4659-9d59-e19539ba0c30/baby_g_ladies_watches_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c34a784-e2c4-4218-8f82-209d5273f081/1794-ie8h_wiring_drawing.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AE 8980 bytes
SHA-256: 72f5d8e71f4f063e9ba8662092faf3c88641cdcb2f3f486713d1cebb85e5789e
font_01_sfnt_off000111f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F0 5552 bytes
SHA-256: 5dfcabc4f3f4f1473ed637753a9eabfdb11eb13553696cc66df009e8a9b3e48a
font_02_sfnt_off000124fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FA 2276 bytes
SHA-256: 466a24d7caaef1e1ad2865606ab3524efdda8593c3150e38c474fe2a67759f6f
font_03_sfnt_off00012f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F35 9760 bytes
SHA-256: 644a85dfd1bcebf4ecdf616f8fa78afff1c4fa259b722589878ef76c598f4ad2
font_04_sfnt_off00014a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A45 19468 bytes
SHA-256: d7ae731b971470b89182de9e6fc226cba5119a9fd098284b2d6615c2a2653c58