Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac1ae260b285bb2…

MALICIOUS

PDF

78.6 KB Created: 2021-03-31 07:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78c4e90e69730ec04f1161c9aabc01e9 SHA-1: d4f95ff539b25b4b4f7a33bdf7845434fcb2cd04 SHA-256: 4ac1ae260b285bb2c95a5366bfc796295a4ea8fdebe5cd5768f547faf43e475b
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with a primary external URI pointing to 'https://dafemum.ru/wix?keyword=craigslist+dallas+jobs', suggesting a phishing or credential harvesting attempt disguised as job search results. The PDF's structure and numerous links also indicate it functions as a link farm, likely to distribute further malicious content or to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dafemum.ru/wix?keyword=craigslist+dallas+jobs
    • https://static.s123-cdn-static.com/uploads/4402246/normal_6000a05fdadef.pdf
    • https://cdn-cms.f-static.net/uploads/4486751/normal_6046943194abf.pdf
    • http://idealslim-italiaofficial.site/how_to_use_samsung_camcorder_as_webcamco1iz.pdf
    • https://cdn-cms.f-static.net/uploads/4492897/normal_603f307c79fc5.pdf
    • http://rofogukiluvupu.mygamesonline.org/vuwukaremefe.pdf
    • http://fastcreditreport.info/avengers_logo_fonta31l8.pdf
    • https://static.s123-cdn-static.com/uploads/4465400/normal_5ff483ecb0a3d.pdf
    • http://barberking.best/669842998691jot0.pdf
    • https://cdn-cms.f-static.net/uploads/4456140/normal_602e286ad377f.pdf
    • http://pokupka.space/epson_powerlite_home_cinema_730hd_lamp9wt5b.pdf
    • https://static.s123-cdn-static.com/uploads/4382958/normal_5ff255cabe745.pdf
    • https://cdn-cms.f-static.net/uploads/4463272/normal_60187a84d32e4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://189c2d36-84ff-4b81-9465-96c33c1d3b91.filesusr.com/ugd/35ddae_ca7b65cb16614171bece04e74c07dccc.pdf?index=true
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_49ca1af974054b06bb6b92a72074978b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d657f35b-293b-47e9-b8ec-ef185c162d82/lotilox.pdf
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_c8aca1b0848744449d692f64e83df748.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1c4a4b3d-1142-4cf8-854f-2ac0ee7132a2/do_division_2_and_3_schools_give_athletic_scholarships.pdf
    • http://bogalibamadom.myartsonline.com/vadinuwavilesozi.pdf
    • https://uploads.strikinglycdn.com/files/697e1f0e-8925-4757-91bd-85677c190756/theme_of_after_twenty_years_and_a_retrieved_reformation.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea3d.bin
c03dac08779c17fe174fcda7ca3cb2f77092678b17c5c1d1bb96525a4a61dbbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3D 4796 bytes
font_01_sfnt_off0000fa96.bin
1784d3e883e96e531c43952d763460dcade6d611767ee62ceb0948059f73cd17		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA96 10768 bytes
font_02_sfnt_off00011f46.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F46 4324 bytes

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