Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8ff9707f07589be…

MALICIOUS

PDF

80.8 KB Created: 2021-06-03 09:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c3ba6d83d8303a1fb732773204cb4c05 SHA-1: 7243b5d19a6ae61a0ee901677fdbc390654644e2 SHA-256: e8ff9707f07589be37f89885ea393459304c0148af51c2caa8386341d3a66e95
126 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, characteristic of a link farm or SEO spam campaign. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs points towards an attempt to redirect users to potentially harmful content. No scripts were extracted, but the PDF structure itself is used to host a large number of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/123?utm_term=halloween+fgo+2019+na+guide PDF link annotation
    • https://taxurazuzar.weebly.com/uploads/1/3/4/0/134042721/65a3668.pdfIn PDF document text
    • https://kamedewogivazu.weebly.com/uploads/1/3/4/0/134096977/xininikukikatewo.pdfIn PDF document text
    • https://vatewiwep.weebly.com/uploads/1/3/4/4/134482367/baniweferexo.pdfIn PDF document text
    • https://xuwovovap.weebly.com/uploads/1/3/1/6/131607152/2781f.pdfIn PDF document text
    • https://metekubop.weebly.com/uploads/1/3/1/4/131438843/xisum.pdfIn PDF document text
    • https://jefevitekigo.weebly.com/uploads/1/3/4/5/134586767/jitiwe.pdfIn PDF document text
    • https://jajaleregonu.weebly.com/uploads/1/3/4/2/134235513/belofedat-kenivumemel-ritelajunasi.pdfIn PDF document text
    • https://gumopokexu.weebly.com/uploads/1/3/0/8/130814161/9808687.pdfIn PDF document text
    • https://felinabaf.weebly.com/uploads/1/3/4/3/134380667/2494451.pdfIn PDF document text
    • https://sezitekiporav.weebly.com/uploads/1/3/4/6/134627959/gawujefuvipokew-zasibotojalapu.pdfIn PDF document text
    • https://zolerowiz.weebly.com/uploads/1/3/4/6/134691656/2b18b79a2.pdfIn PDF document text
    • https://nobametu.weebly.com/uploads/1/3/2/7/132740930/lajid.pdfIn PDF document text
    • https://fajasorefasox.weebly.com/uploads/1/3/4/3/134348900/zuwovapuko_pexogarobenenu.pdfIn PDF document text
    • https://vesasasafej.weebly.com/uploads/1/3/4/7/134758359/jizagera.pdfIn PDF document text
    • https://mutuvedaluvop.weebly.com/uploads/1/3/1/8/131856278/c2ddcc8c6ed.pdfIn PDF document text
    • https://nivirijimukavut.weebly.com/uploads/1/3/2/6/132681164/4a412e8ab.pdfIn PDF document text
    • https://rewiwolidinagi.weebly.com/uploads/1/3/4/4/134481042/9aabebc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/56378c6d-f89b-4152-a9df-3f01c4bc5683/44697911221.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce0af812-8ec3-4e71-9dae-bdf8e0a09604/69675194424.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dbe90c1-af2d-4dc4-903c-be9c30804ea1/22217330101.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe020f94-69be-45d6-90f7-1bb477c1ccbc/empty_periodic_table_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7764ed58-7bda-48cb-9db1-782a0ba6872a/jibenosiwixe.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8D 5336 bytes
SHA-256: 74561d3c973eb89d1c3952eb56623af8ea621e028c45aa5f4f9429a0e552dfb5
font_01_sfnt_off00010ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE6 11296 bytes
SHA-256: 88880e844363f5d0b8c19f553ba9d40052df579fac40db0ca267e9f621363a09