Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8ef5f893d14bf2…

MALICIOUS

PDF

71.4 KB Created: 2021-05-29 09:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d66fcfa71f137429b5bebb111b86ce40 SHA-1: eaa747f3feda22966e93951caf85a7679f35fbbb SHA-256: aa8ef5f893d14bf2f017f28c9227fc8179dc8b9ba174120a6581ece5e3259008
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms or phishing lures. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate a large number of links pointing to potentially disposable domains, suggesting an attempt to obscure the true destination or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/123?utm_term=bogue+pier+fishing+report PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378404/normal_600e42f96390f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387037/normal_5fc61440f0d55.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417997/normal_5ffea2eed50b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426071/normal_5fefbe3138896.pdfIn PDF document text
    • https://godosofebi.weebly.com/uploads/1/3/4/6/134651625/fomomodu-faket-gejijeban-gilezaso.pdfIn PDF document text
    • https://gemujofu.weebly.com/uploads/1/3/4/3/134372819/28be5163f.pdfIn PDF document text
    • https://natatujefeni.weebly.com/uploads/1/3/1/6/131607075/3936650.pdfIn PDF document text
    • https://nedotumawu.weebly.com/uploads/1/3/4/6/134626041/simawozaw-mibefafojixaj-somuwadafonup-xogazodebowa.pdfIn PDF document text
    • https://runevivapubate.weebly.com/uploads/1/3/4/5/134595370/99a248af015d.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/5e1ad6ae-9635-48a0-a5b3-8bc16792bfa2/44489305266.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8dc7c76-37e5-4cc9-8245-d66b6175b2f3/12867224910.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a775f91-b219-4f31-86ff-c772a305e2a1/44805672604.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30c3ffd2-2ae8-41f1-ad30-5456004a7007/5500237318.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2c8899b-3ade-458d-bac1-6368b3a279cd/century_120v_welder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80ff0964-f2ee-4b84-b91d-c872389759e0/what_was_maya_angelou_famous_for.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6efd742-b305-4724-9d66-2dc6380a09af/81883228648.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a49c7f3b-f7f6-4970-a8cf-5b76f6924696/22533623794.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3c3420a-01ef-4456-ab48-a78e3860a9c6/60561204087.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0cdb431-40ab-4222-abdd-397bfe04430a/camilo_y_evaluna_matrimonio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/144d78e1-398f-463e-9193-47bb2528c3c5/81367975712.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b60fa4b8-c826-49b2-bdff-924ec11095b7/raynor_garage_door_error_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be2cc304-f1ac-499f-aa76-621aea251d7f/jesubavuxilidokotamefiwa.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_off0000dc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4A 4972 bytes
SHA-256: f97fdc73c9954ada794adccea04078a66d3e3aae9c1d9b938cf1e0b5bca4a15b
font_01_sfnt_off0000ed3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3E 10244 bytes
SHA-256: 303a28e1a828384482842ca8567bbec86002d5bf13c97de699b1e73e525ef4a9