Malicious PDF — malware analysis report

Static analysis result for SHA-256 b99e78e4436b3545…

MALICIOUS

PDF

92.8 KB Created: 2021-02-25 16:49:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f71e23a107161a17e88a459146fbe415 SHA-1: 6eefe6e5fbfce0a28fa9a303c03db393a37b2dea SHA-256: b99e78e4436b3545f8f8e51cbd73029ea57303387cabaeb163201420df7e4dc9
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to link farms and disposable hosting, indicating a likely attempt to redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing or malware distribution attempt. No scripts were extracted, but the presence of many external URIs suggests a focus on web-based lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/123?utm_term=samsung+rf263beaesr+ice+maker+reset PDF link annotation
    • http://zizodoroluxonaf.sportsontheweb.net/how_to_determine_which_solvent_to_use_in_recrystallization.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444378/normal_5fdda074d3075.pdfIn PDF document text
    • https://donurufeto.weebly.com/uploads/1/3/4/8/134898164/resibojinaxogupo.pdfIn PDF document text
    • https://cdn.sqhk.co/wepurodapike/iujcigx/xmeye_cloud_login_not_working.pdfIn PDF document text
    • https://junurewumopu.weebly.com/uploads/1/3/2/7/132740614/8223196.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/dell_venue_8_pro_5855_lte_specs.pdfIn PDF document text
    • https://kutebebi.weebly.com/uploads/1/3/4/5/134528954/9defdbbc3c.pdfIn PDF document text
    • http://suzamajotibe.mywebcommunity.org/94514825999.pdfIn PDF document text
    • https://kewejoxenolubur.weebly.com/uploads/1/3/5/9/135966954/palora-perukur-goruru.pdfIn PDF document text
    • https://cdn.sqhk.co/puzadowoke/yjhLMic/7465526448.pdfIn PDF document text
    • https://cdn.sqhk.co/pananumujo/gjahgrx/monster_trips_chaos_apk_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pikubub.onlinewebshop.net/la_la_land_cast_name.pdfIn PDF document text
    • http://jisijuvod.myartsonline.com/lowes_troy_bilt_riding_mower_blades.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FF 5928 bytes
SHA-256: 2d0dc7c74c0c383c48ddc9a0f0767631fb9b681e5e482edce087fcf8946c7cf3
font_01_sfnt_off00012818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12818 12056 bytes
SHA-256: a4a29a07500c1ea8d6ebe0b9990278e746ed3f5bdf5d3be3cf66a308e1fb5af5
font_02_sfnt_off000150b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150B7 16188 bytes
SHA-256: 357b6184bc20a3f7449b02d77f6fdbcc15c38ba9f4c11aa94ffbf0c2f0ff3bf3

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