Malicious PDF — malware analysis report

Static analysis result for SHA-256 eac8350f13a8c5f9…

MALICIOUS

PDF

73.5 KB Created: 2021-03-05 06:43:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 6106e33c87726db562612c3c617c0cfa SHA-1: 25741fb0f7bc20308a9570614a6d464e0420d582 SHA-256: eac8350f13a8c5f9b9ee29e75adf01250e998b8172a45a32b5192649948612e5
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically flagged as a potential lure to a malicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jacksth.ru/wb?keyword=the%20use%20of%20elements%20of%20arts%20in%20the%20sculpture%20pieta%20color PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4492575/normal_6022fb7154041.pdfIn PDF document text
    • https://cdn.sqhk.co/wimakebibane/jaghUzY/74016772427.pdfIn PDF document text
    • http://vazawujuzu.sportsontheweb.net/how_to_make_homemade_playdough_without_cream_of_tartar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490752/normal_5fdbc26113d3a.pdfIn PDF document text
    • https://cdn.sqhk.co/lagolipumepi/gdjc2m1/adobe_photoshop_fix_apk_uptodown.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484115/normal_6035c087c1479.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365551/normal_5ffa38bb5f96e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391909/normal_5fda8e4fd331b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422373/normal_603e839dd67e2.pdfIn PDF document text
    • http://nejupike.mygamesonline.org/45901072270.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://senesijosezetu.myartsonline.com/why_aggregate_income_is_equal_to_aggregate_expenditure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bd9bc58-f36f-4fda-8204-ca9e847f0e0a/a_supposedly_fun_thing_ill_never_do_again_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3485426-39d3-4824-a43f-a91711ba2d02/43071654134.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f9d1ffe-d4a1-4e9d-be89-020a8a438d33/how_to_train_for_mountaineering.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d71747d9-62bd-4916-9226-a13c81f0a5b5/bram_stoker_description_of_dracula_castle.pdfIn PDF document text
    • http://tavamikilav.myartsonline.com/lejetuviguwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7baaf0a-d9e1-4cd7-8f16-8d641f107e0d/lanevezomowizasigo.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_off0000e327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE327 5204 bytes
SHA-256: 5c8392b41be9765956193bcf9c45bed832500f65d4abf17da8504894de489231
font_01_sfnt_off0000f4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AB 10724 bytes
SHA-256: b990bfcc9d9034747e841860a5d545fe35b7d2066b27cc61a609d92dac4c2b3a

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