Malicious PDF — malware analysis report

Static analysis result for SHA-256 834cf3e423379720…

MALICIOUS

PDF

77.1 KB Created: 2021-05-30 00:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6dcd298ede543310af310ca564b29f5e SHA-1: e673720857a868e0ca0467aa024dd653444120c7 SHA-256: 834cf3e423379720c6c4195a14cfb084f11f8923839d264569878b70a5575cb9
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 0.9997

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://botokaw.ru/strik?utm_term=can+drinking+alcohol+cause+gastroesophageal+reflux+disease PDF link annotation
    • https://teretusux.weebly.com/uploads/1/3/4/6/134687242/natezusexibomozapuw.pdfIn PDF document text
    • https://dugizixenopiloj.weebly.com/uploads/1/3/4/4/134457585/597101.pdfIn PDF document text
    • https://bevoparekev.weebly.com/uploads/1/3/4/0/134018333/9254530.pdfIn PDF document text
    • https://julotovodirol.weebly.com/uploads/1/3/4/5/134522883/dufetu-bufewivituputad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451350/normal_5fc7cb8a03eff.pdfIn PDF document text
    • https://pibefugaradaxo.weebly.com/uploads/1/3/1/3/131398186/fepenuwovotujo-jelamojelof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393625/normal_5fd6538f49970.pdfIn PDF document text
    • https://naridinefe.weebly.com/uploads/1/3/5/9/135959872/08a2f01f392be.pdfIn PDF document text
    • https://piladokad.weebly.com/uploads/1/3/4/7/134759874/4452470.pdfIn PDF document text
    • https://zuligenewem.weebly.com/uploads/1/3/4/7/134749141/visaborep-xikulasatalilap-jurero-batefafot.pdfIn PDF document text
    • https://peretokat.weebly.com/uploads/1/3/4/0/134040551/buxipuvinaxoduwet.pdfIn PDF document text
    • https://ponitunol.weebly.com/uploads/1/3/4/7/134747778/fewapimupuxux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449605/normal_5fe69f0d4c2f7.pdfIn PDF document text
    • https://poxuxeket.weebly.com/uploads/1/3/3/9/133997588/rakej.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/6c30595d-8085-464d-bbac-f83738874819/sepogevezevirosunogud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dda3c3a5-6213-42dd-b1bd-40ff24cfa024/exercice_figure_de_style_1ere_bac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b28d71da-3551-4eb4-a027-e2975894da25/what_is_toast_speech_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e6de43e-fb48-4849-8ecf-51fc7c6e1052/26814614093.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1186e0f-d946-47cd-a69e-4a44aeb76ea6/38429553084.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11b6aa8a-f229-4376-9716-6f3da410f9eb/well_always_have_summer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a31d0b5e-5e8a-4577-8408-2ea1240f872c/should_you_soak_wood_chips_for_masterbuilt_electric_smoker.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_off0000f1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CE 5452 bytes
SHA-256: 9ed88b06409cccf776f61ac2f0db2f45bf35075f7af7e7cbf0965bbdd698ac33
font_01_sfnt_off0001045b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045B 10076 bytes
SHA-256: 8a9890fd86ec938d266d55eb9b6f360f9878b0967b2bdeab04bea04c594e43d1