Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d57ded74392124f…

MALICIOUS

PDF

72.7 KB Created: 2021-03-10 05:08:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 05edb0a08f34e2c83fb86177feb5209b SHA-1: e23a0515d1f1e93a185b19f6d879ca441016403a SHA-256: 6d57ded74392124f8c2068943c9f9ad16e3216588fb8d497e3a89d6259fcadae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many pointing to disposable domains and Weebly-hosted files, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. The embedded URLs and the nature of the link farm suggest an attempt to manipulate search engine results or distribute further malicious content.

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://leonvi.ru/123?utm_term=autocad+2010+installer+with+crack+free PDF link annotation
    • https://wowevabesal.weebly.com/uploads/1/3/5/3/135322278/76cb81d2e703f0.pdfIn PDF document text
    • http://ru-1.casa/64755597719ooh0o.pdfIn PDF document text
    • http://cashthe.ru/xategewufaronlac4.pdfIn PDF document text
    • https://lijimoxa.weebly.com/uploads/1/3/0/9/130969704/sumosuwemup.pdfIn PDF document text
    • https://pifavakibapel.weebly.com/uploads/1/3/0/8/130814246/461674.pdfIn PDF document text
    • http://texno3ua.com/tuvirlipad.pdfIn PDF document text
    • https://datokusowijodo.weebly.com/uploads/1/3/0/7/130776434/sujoxejovojobu.pdfIn PDF document text
    • https://wokulenazaxur.weebly.com/uploads/1/3/4/7/134744474/baxuludejadifike.pdfIn PDF document text
    • https://viwutexotopuj.weebly.com/uploads/1/3/4/5/134522905/rababoxowozos.pdfIn PDF document text
    • https://gagofabujinu.weebly.com/uploads/1/3/0/7/130739012/7ede8d30beba9.pdfIn PDF document text
    • https://kasasifu.weebly.com/uploads/1/3/4/6/134697732/dafup.pdfIn PDF document text
    • https://bipekafus.weebly.com/uploads/1/3/0/7/130776646/tizefoletusu.pdfIn PDF document text
    • http://trysoda.club/vigokedukusagezatolepifus0szh4.pdfIn PDF document text
    • http://biomaniks.website/kubivubarilozgpm3.pdfIn PDF document text
    • http://winfreeiphone.xyz/akai_mpc2000xl_operating_system9v29k.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/8a135bfd-54df-477e-ad49-18699dc23089/gowapipusajebipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b237979-6952-481d-b93a-99152ff5a8f2/how_do_directv_work_with_at_to_my_tv.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_off0000dd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9D 5580 bytes
SHA-256: 8fd6b07f070b10110f062148f34192f3f473ed3f0dfe5f06992d89a20742143a
font_01_sfnt_off0000f0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AB 10424 bytes
SHA-256: 81bfa6469fd5eee22772dbdcda125a11d63308a612e02c907b73a59cd355220f

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