Malicious PDF — malware analysis report

Static analysis result for SHA-256 51453fd2baac088c…

MALICIOUS

PDF

108.7 KB Created: 2021-03-16 19:33:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 3014b106b93260376a061969cc3651fc SHA-1: fcfd06a7e4b229ffad91c8f6904a19f31314d9cd SHA-256: 51453fd2baac088c898c96253792c4f87b7b1653938c722bd98e1b6b7b43f1fa
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://gimoguvi.ru/award?keyword=overcoming+barriers+to+communication+pdf PDF link annotation
    • http://saleproducts.pro/publicly_traded_survival_food_companiesofbkj.pdfIn PDF document text
    • http://dokukuke.mypressonline.com/basic_life_skills_for_adults_with_disabilities.pdfIn PDF document text
    • http://konalofasu.mywebcommunity.org/ti_nspire_cx_games_pokemon_download.pdfIn PDF document text
    • http://limaxinsto.xyz/how_to_do_a_running_workoutw0eie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445864/normal_6019d3fc1bd2a.pdfIn PDF document text
    • http://lirebuwoke.mygamesonline.org/36617833527.pdfIn PDF document text
    • http://goodxday.xyz/84895715304lyvn6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447903/normal_603358fa9cbdb.pdfIn PDF document text
    • http://buwovavozu.getenjoyment.net/8586736722.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465685/normal_6049080a59539.pdfIn PDF document text
    • http://accueilcmb.com/43608496060rmw9k.pdfIn PDF document text
    • http://idealicagocce.site/kosapoxujitipezewupavezdosz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491148/normal_6031d310708d7.pdfIn PDF document text
    • http://xtreme-sport.ru/jersey_mikes_turkey_sub_caloriesp01o7.pdfIn PDF document text
    • http://rivepozepuxar.mywebcommunity.org/how_to_clean_cuisinart_single_serve.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://uploads.strikinglycdn.com/files/a40dfbae-a459-42cc-9e78-7812a25c3045/ford_escape_engine_not_starting.pdfIn PDF document text
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_14ea2ee1c81440d888124ba41e2d6c8a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a279ac1-fd0c-4e5c-a447-a23d644efa88/15358462780.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68324f1b-833c-4912-8910-79bea2da3293/canon_eos_20d.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d603c401-1c07-4ba4-a47c-886a70b576df/fugonaxilit.pdfIn PDF document text
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_a8f42cb6fdd140e088c839ed75120dee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dc58386-121f-4e47-be4c-bf3f13d1e6ba/corsair_gaming_k95_rgb_platinum_cherry_mx_brown.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E3B 5552 bytes
SHA-256: f47e56c59329e9785170e688bfe083ef424c3b5e6aa7cc2990f97283007313e5
font_01_sfnt_off000170ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170FF 11052 bytes
SHA-256: f0f524d4dd81345493dc1df3017ac9bfb9b62a9537cf239b198c05dfb8f76880
font_02_sfnt_off0001967f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1967F 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e