Malicious PDF — malware analysis report

Static analysis result for SHA-256 d23a0ba81da6d616…

MALICIOUS

PDF

55.4 KB Created: 2020-10-30 21:31:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c0986b733134bbdc893de8d70dede541 SHA-1: dc7ca8fb47d2e0629be85004c7c8000187425da8 SHA-256: d23a0ba81da6d6165504e023a2d3ef03f8c3e5e35db80d98bfcf094f729542cb
184 Risk Score

Malware Insights

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

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ttraff.link/123?keyword=lake+asbury+junior+high In PDF document text
    • https://nobinetezo.weebly.com/uploads/1/3/0/9/130969761/gexipogug.pdfIn PDF document text
    • https://gogozugibijom.weebly.com/uploads/1/3/4/3/134369614/rufujuv.pdfIn PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/vebeferisebolix.pdfIn PDF document text
    • https://xibogunef.weebly.com/uploads/1/3/1/3/131398295/fulixirezufotu.pdfIn PDF document text
    • https://zinawadasug.weebly.com/uploads/1/3/4/3/134312837/5877370.pdfIn PDF document text
    • https://gusumadanu.weebly.com/uploads/1/3/2/6/132695601/pasex.pdfIn PDF document text
    • https://fupuvoriru.weebly.com/uploads/1/3/4/4/134494751/zawugikoworepoj_nanumomijosise_getunikamup_furoji.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/zakeme.pdfIn PDF document text
    • https://wozijasobinela.weebly.com/uploads/1/3/4/4/134445001/287080.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/susopuzupure/emotional_intelligence_worksheets_for_adults.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/betrayal_at_house_on_the_hill_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0464/1502/0200/files/ririretovewuzimig.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/tejupurufezon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/1421/5582/files/the_figure_above_shows_the_graphs_of_the_functions_f_and_g.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9921/2964/files/canon_5d_mark_iii_manual_focus.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65BE 12164 bytes
SHA-256: 8cd7387e6d5825d587f76d92ac551963315660c6f1f167f16d35e7b5a7e9e1df
font_01_sfnt_off00008d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D71 5040 bytes
SHA-256: 1ee91be482f56ba49bbe1d8d3071b2a5279bdd1ce6d0f9f47668dce3d72aaf4b
font_02_sfnt_off00009e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E92 9920 bytes
SHA-256: ad38d812385a8856f917cbd88dcf303d04550be5f9f83f7fc371fd78480e664a
font_03_sfnt_off0000c098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC098 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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