Malicious PDF — malware analysis report

Static analysis result for SHA-256 f94bc57c13f41ce2…

MALICIOUS

PDF

90.8 KB Created: 2021-05-08 18:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 04b351beb6814eaae65cda36626fd2b8 SHA-1: 116b9162ec56c939ce7b0bbbb441f396e56fada7 SHA-256: f94bc57c13f41ce27d652d1742870da70b2e42678fc74ce26596b166fae546a4
66 Risk Score
Tags
free-cdn-ebook-manual-lure

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://soxebez.ru/strik?utm_term=biological+psychologists+definition+ap+psychology PDF link annotation
    • http://bajesiradevo.getenjoyment.net/71645193584.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376600/normal_5fd33ff49f3b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444850/normal_6043782c3171c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419430/normal_5fdf58998d534.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453907/normal_5ffe8a7404193.pdfIn PDF document text
    • http://vomamafawib.scienceontheweb.net/zopokuwuruxijiwa.pdfIn PDF document text
    • http://gazajujana.mygamesonline.org/86010947484.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383925/normal_60542c4fdda4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391602/normal_605fbc079a46a.pdfIn PDF document text
    • http://nitiwomifigurod.mygamesonline.org/buvifokisarikula.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501037/normal_600f22c81f359.pdfIn PDF document text
    • http://rozujed.sportsontheweb.net/hunter_sprinkler_xc600_x-core_6-station_outdoor_irrigation_controller.pdfIn PDF document text
    • http://tapozifokun.mywebcommunity.org/coca_cola_advertising_strategy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458833/normal_604ba186857ea.pdfIn PDF document text
    • http://nefutekugurenap.mygamesonline.org/sifonugulovamam.pdfIn PDF document text
    • http://jivavesomuviz.getenjoyment.net/strategic_communication.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/minecraft_windows_10_download_free_2020.pdfIn PDF document text
    • http://riveminigokoxa.myartsonline.com/70696830771.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/77621112713.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/aud_to_vnd_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/free_calendar_template_in_html.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/is_cfa_prestigious.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_off00012420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12420 5472 bytes
SHA-256: d3cd330ab607e6e87fe95d95a09167af2f64cd8aabeec1be5ead82ae694941a2
font_01_sfnt_off000136c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C7 10896 bytes
SHA-256: 1b1c1c264a3bbb0198ff34d19c8645421aeaadffdd253355ef327c01e086d77e

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