Malicious PDF — malware analysis report

Static analysis result for SHA-256 c47c9a4b6d01090f…

MALICIOUS

PDF

96.2 KB Created: 2021-03-07 05:39:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e77aabddb0a28516ff3d971df1e2cc3e SHA-1: 67e69896f97739f18fde3f3b0571082889016984 SHA-256: c47c9a4b6d01090fd70ad6636d34ddeccd44ca7cd9c4526dbed108eb8f4fbdf6
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation scheme. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were directly extracted, the presence of numerous external URLs suggests a potential for redirecting users to malicious sites or downloading further payloads.

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://pelibifir.ru/aws?utm_term=how+to+train+your+dragon+toothless+voice+actor PDF link annotation
    • https://pabarasoziraw.weebly.com/uploads/1/3/5/3/135324669/2610268.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445558/normal_5fc6a7d51f557.pdfIn PDF document text
    • https://cdn.sqhk.co/noneniwetav/hdg4Jjf/pomobelewusof.pdfIn PDF document text
    • https://notemuwos.weebly.com/uploads/1/3/4/7/134717082/jovedojizugezap.pdfIn PDF document text
    • https://nagipabusodeza.weebly.com/uploads/1/3/1/4/131453106/tazewawazazopinav.pdfIn PDF document text
    • https://cdn.sqhk.co/kagumuzom/dRggfhf/global_warming_definition_ap_human_geography.pdfIn PDF document text
    • https://cdn.sqhk.co/dodamewope/Ehegjhh/zombie_tsunami_hack_level.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470399/normal_5fd68c1d9eaa1.pdfIn PDF document text
    • https://sufidubiziden.weebly.com/uploads/1/3/4/7/134732268/634446b7.pdfIn PDF document text
    • https://lelodudovoveju.weebly.com/uploads/1/3/1/6/131607117/8787942.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454544/normal_5fe90f29b707d.pdfIn PDF document text
    • https://penugevofubelig.weebly.com/uploads/1/3/1/1/131164238/roxijaguwujo.pdfIn PDF document text
    • https://rukufutuseju.weebly.com/uploads/1/3/4/7/134748195/745c8.pdfIn PDF document text
    • http://mybiol.site/zipesofovosijifd06uj.pdfIn PDF document text
    • http://rte-ita.fun/safuruzanowikavewlx22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462726/normal_5fe96c048a99b.pdfIn PDF document text
    • https://majuxakitififez.weebly.com/uploads/1/3/0/7/130738909/lixodul_xumux_mumida_sogagelusik.pdfIn PDF document text
    • https://cdn.sqhk.co/lufelumad/igidijg/rotator_cuff_muscles_exercises.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_c1f5667de4df453588e90cc07744c6a8.pdf?index=trueIn PDF document text
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_395032294d2242d5a7337c327fb0aacd.pdf?index=trueIn 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_off0001382c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1382C 5416 bytes
SHA-256: 95d241aa8a4807b9d93acc242b6ac2a500d10bde24a10f21052bb9004e47534d
font_01_sfnt_off00014ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AB2 12304 bytes
SHA-256: 3729d26b8179914b1c08f4bf60e4af20844d8c6e9f20a8f856aff19ef082ba72

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