Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e60e757e670f9d…

MALICIOUS

PDF

89.2 KB Created: 2021-03-14 02:51:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8379eadadf154b1528648cfc0c96af6f SHA-1: 5f3d3230a7a547e674af5a55cb298051885a893a SHA-256: b4e60e757e670f9d6060fbc4bca94ebf17a3d968c79ffdf4a8780f345e4b3b05
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as 'Pdf.Phishing.Trojan'. The ML classifier also strongly indicates maliciousness. The document body, though heavily obfuscated, contains keywords related to the embedded URLs, suggesting a lure to external malicious content. The presence of embedded JavaScript further supports the malicious intent, likely for redirecting users or executing further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/award?keyword=apgar+score+pada+bayi+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421354/normal_603b47454283e.pdfIn PDF document text
    • http://jilet1.club/worksheet_works_diamond_math_problemsvc6v0.pdfIn PDF document text
    • http://igcopyrightclient.com/99495222459yf5cz.pdfIn PDF document text
    • http://tehnotop.site/12550108065mj2tc.pdfIn PDF document text
    • http://p-kavkaza.ru/hamilton_beach_flexbrew_err_message9q5qu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387433/normal_5fc5b8b5a7325.pdfIn PDF document text
    • http://zitirisiz.mywebcommunity.org/what_is_a_family_emergency_communication_plan.pdfIn PDF document text
    • http://zuduwamani.mypressonline.com/39513432133.pdfIn PDF document text
    • http://barbanapoli.moscow/silonezakowilopeac9gp.pdfIn PDF document text
    • http://duxinivodozular.mywebcommunity.org/mercury_9.9_4_stroke_carburetor.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://s3.amazonaws.com/kefodek/91546122205.pdfIn PDF document text
    • http://wurunuj.epizy.com/90210577419.pdfIn PDF document text
    • http://doriponesarom.myartsonline.com/7038175217.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/carbon_steel_mechanical_properties.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/chrome_for_pc_windows.pdfIn PDF document text
    • http://bobupugarini.epizy.com/fcip_medical_degree_full_form.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_off00011417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11417 5124 bytes
SHA-256: 7969a43fabc0af069099e010e65eb65e970d8eac4a310aefb2cba23d4a61e5c6
font_01_sfnt_off00012592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12592 10508 bytes
SHA-256: 8be3d824fe6f18653106bbd11da10dc9969b8a8b7b86cae79b33125467a3263a
font_02_sfnt_off0001494f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1494F 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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