Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b64d6663b837d2d…

MALICIOUS

PDF

36.3 KB Created: 2020-11-09 10:56:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 518678789ad32425254b4bf96a9da066 SHA-1: 5d727d16c1e2935654091fac7749d674bc6be23b SHA-256: 4b64d6663b837d2d79a0612a1680faa6376840685ec5960a476053527316152d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 1.0000

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://trafftec.ru/aws?keyword=jurassic+park+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387421/normal_5f94aa4d4d621.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ziziwugo.files.wordpress.com/2020/11/28189182835.pdfIn PDF document text
    • https://gujivog.files.wordpress.com/2020/11/arihant_encyclopedia_of_general_science_download.pdfIn PDF document text
    • https://lugukanit.files.wordpress.com/2020/11/rizupuduvebiko.pdfIn PDF document text
    • https://lulukevonifu.files.wordpress.com/2020/11/damonps2_ps2_pro_apk_latest_version_revdl.pdfIn PDF document text
    • https://bimonebi.files.wordpress.com/2020/11/dungeons_and_dragons_basic_set.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/cabal_on_nessus_reddit.pdfIn PDF document text
    • https://vabavoresadi.files.wordpress.com/2020/11/debewasomogoro.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/robebumelivuzino.pdfIn PDF document text
    • https://tevarew.files.wordpress.com/2020/11/88608638079.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f23473dc-67e7-4b52-9786-c28c7a837e47/10679538281.pdfIn PDF document text
    • https://tofegunobu.files.wordpress.com/2020/11/pikegesumemuvibimemu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000496f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x496F 5136 bytes
SHA-256: d93fefcad184d584a798de8548f642bbd4528b89c90b7cd5d808df55598a55ac
font_01_sfnt_off00005af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AF5 16500 bytes
SHA-256: b4a4df110ce3357492e7c8d0a40a080a3248ca059cdff12e5b4d469613938263

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