Malicious PDF — malware analysis report

Static analysis result for SHA-256 4db396c003498f1e…

MALICIOUS

PDF

69.4 KB Created: 2021-02-26 21:50:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7ef63e304f02a8fac98e569b8c01757f SHA-1: 76a6872b1782d5694746b43c7ea97f43437bc763 SHA-256: 4db396c003498f1ee6bac2df1ef0d1d211b14f3b0126b60392d30a8946af66b7
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous external URIs, many pointing to disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/wix?keyword=animal+cell+coloring+worksheet+labeled PDF link annotation
    • http://legrand-spb.ru/warframe_ducats_guideiq06e.pdfIn PDF document text
    • http://4kuhd.me/dodge_stratus_2006_headlight_bulb89knl.pdfIn PDF document text
    • http://rurojewof.22web.org/sandisk_clip_sport_plus_user_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/xurunesijud/uDwkgdh/kumorakixug.pdfIn PDF document text
    • https://cdn.sqhk.co/gixelotopa/gegc1ZE/bebitonewo.pdfIn PDF document text
    • http://idealica-tufficiale.website/minn_kota_riptide_80_lb._thrust_trolling_motorldmim.pdfIn PDF document text
    • https://cdn.sqhk.co/naxetimi/dwSwbjf/paypal_account_set_up_uk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446914/normal_5fecc31cedfab.pdfIn PDF document text
    • http://buytoday.cc/755980445528heu3.pdfIn PDF document text
    • http://lightly.store/buwudazemoxegel8w1nb.pdfIn PDF document text
    • http://ppl-nutrshopfit.website/e-_verify_form_usaoaoxw.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/sagotomagin/platform_bed_diy_storage.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_off0000d2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FC 5640 bytes
SHA-256: 3db97babb6e26a743499135e03772a17159c0aa3992f843b170af42740849bb3
font_01_sfnt_off0000e606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE606 10212 bytes
SHA-256: f37d4dc55a96abda84396a83f8a6d42cc056b14a49b6ad5c65b69ca6c60a199d

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