Malicious PDF — malware analysis report

Static analysis result for SHA-256 5285b7a330688024…

MALICIOUS

PDF

68.6 KB Created: 2021-06-14 08:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 951970711cb3a9d523a9709ea2c271d9 SHA-1: 663a939106e8b3632e4730e0a10a7bb7a553fceb SHA-256: 5285b7a330688024078cffb5138e4deece3c7c4a7c1cdc609a1c60a30bdf0d4a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by an ML classifier as malicious and contains a significant number of external links, many hosted on disposable domains. This indicates a likely attempt to lure users to malicious sites, potentially for phishing or to download further malware. The presence of a link farm heuristic further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nomylo.ru/pbw?utm_term=if+clauses+test+pdf PDF link annotation
    • https://bosuzegenelulu.weebly.com/uploads/1/3/4/1/134131522/vumoninag_gefelonukomuro_zurebowam_gebibirisot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462678/normal_60c3057352f74.pdfIn PDF document text
    • https://bozetefaz.weebly.com/uploads/1/3/4/7/134733050/lofubewina_nozukawesimike_mosokedafesamo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481993/normal_601c9b05a5c1b.pdfIn PDF document text
    • https://fufivivol.weebly.com/uploads/1/3/0/8/130873849/jaxedutug_muzeziwu_zogano_jewuwebod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388280/normal_6039f4b69d1d2.pdfIn PDF document text
    • https://pegepigav.weebly.com/uploads/1/3/4/4/134481067/kabiwifusaporavax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413002/normal_60312999f09a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499635/normal_6025b6d4384bc.pdfIn PDF document text
    • https://fudaxanoduvilu.weebly.com/uploads/1/3/4/6/134626593/76df85d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366402/normal_60500031b1357.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408983/normal_603b41afa14cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460263/normal_605da83b3a853.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413369/normal_60bda79fbf6df.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://niluputevi.pbworks.com/f/how_to_herbarium_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9a77377-5b86-4eb2-880c-9d48cbb85077/what_is_the_origin_of_our_species.pdfIn PDF document text
    • http://mumubib.pbworks.com/f/96281506542.pdfIn PDF document text
    • http://magogopowo.pbworks.com/f/benim_hocam_haritalarla_corafya.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32dae987-cf9e-485a-ae6e-f17147cbb996/lay_minister_catholic.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_off0000d207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD207 4988 bytes
SHA-256: be1ed21b9c3a2da80704b6c9982a1cbfebf3b8a2f5145d614dd37bcc1363b3bc
font_01_sfnt_off0000e319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE319 10176 bytes
SHA-256: 1f72706962421bdae70978a2bc0f9fbeaf42c03952f2f12c8765129405dcf8a6

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