Malicious PDF — malware analysis report

Static analysis result for SHA-256 128860982ea61b13…

MALICIOUS

PDF

46.5 KB Created: 2020-11-09 16:04:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 8aeb38c1c7e52955cf979e46058fdad1 SHA-1: 98ada80e90eb518afab16b52da76979bc4b8f2f9 SHA-256: 128860982ea61b13a474fe6ca8976db3ed90d61f893fe3475905c94c3f92cae4
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 1.0000

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://trafficel.ru/aws?keyword=my+name+sandra+cisneros+text PDF link annotation
    • https://jutebipofan.weebly.com/uploads/1/3/4/3/134334370/risolivuzanowav-tovasi.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/nimemoroligamaj-tafixidupara.pdfIn PDF document text
    • https://jixobufasov.weebly.com/uploads/1/3/4/3/134324480/sijemoluni.pdfIn PDF document text
    • https://bijifejutumaxob.weebly.com/uploads/1/3/1/3/131381781/8636871.pdfIn PDF document text
    • https://fukoxifixe.weebly.com/uploads/1/3/4/4/134460993/0fe4d8285.pdfIn PDF document text
    • https://xejibojap.weebly.com/uploads/1/3/4/3/134310503/xabogim-begob-talokezol-fitolabaxinuri.pdfIn PDF document text
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/gakita.pdfIn PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/jukiwoponosezar.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/41c1f5fe-10f0-447b-8e9a-4c4f6012aa31/delonghi_turbo_convection_oven_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/kuwusudupawuriginotewono.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b96250ed-f29a-41fe-97ae-e3db69f730a6/1147571851.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fb1cbe4-7a0b-46e8-affb-1a203a97432d/cub_cadet_524_swe_manual_cz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27444ae2-f576-4e58-be02-96ee96be8f27/novidelug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5def7e74-e8a3-44ce-9c28-6c9dc71eff9a/aprilaire_thermostat_8620_manual.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_off000076e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76E7 5228 bytes
SHA-256: 1fe5b7b61be05739f38331d21018709919ead5a9994ef8458551660a4972eec1
font_01_sfnt_off000088b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88B0 10724 bytes
SHA-256: f69b1c2cd69bb99cd3311e3189240af6bc151c842f4f64c41b775ef9adb1d5ec