Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2e3861bb8f2e946…

MALICIOUS

PDF

74.2 KB Created: 2021-02-28 21:07:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 04b1fbf4daff0d3c64b2fc101a420670 SHA-1: 0897e6702b4ec1fb3b307695d1e806501bafb828 SHA-256: e2e3861bb8f2e9465d1b385b3bc9003394290a6cf64dce73a0127bb3456e6537
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier also flagged the PDF with high confidence. While no scripts were explicitly extracted, the nature of the heuristics and the presence of numerous links suggest an attempt to lure users to malicious sites, likely for phishing or to download further payloads.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wb?keyword=disgraced%20ayad%20akhtar%20book In PDF document text
    • https://kisagisetiduke.weebly.com/uploads/1/3/4/7/134762251/ratemavo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419195/normal_600b1f7ce899a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414152/normal_5fc5e9d4937b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369499/normal_5ff1b05e6d230.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459163/normal_5fe8d8de732e0.pdfIn PDF document text
    • http://sberbank.link/network_marketing_success_secretshss77.pdfIn PDF document text
    • https://sowurudiz.weebly.com/uploads/1/3/1/4/131438308/90dca1dcd1b.pdfIn PDF document text
    • http://ita-bio.space/herbceas_o_que6rtlq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366668/normal_6017921c374f8.pdfIn PDF document text
    • https://kuribigewisowe.weebly.com/uploads/1/3/4/6/134688213/2946658.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417406/normal_60026803ddadc.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/garorowa/75695802391.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/tafavana.pdfIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/corrugated_metal_sheets_6ft.pdfIn PDF document text
    • http://dokudaruriwiv.atwebpages.com/what_is_volumetric_efficiency_of_compressor.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_off0000e4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DB 5476 bytes
SHA-256: 9aeaddaf3d9ba1e3393023d9c1976bcf301751ace05a96ba51835b28a46ff318
font_01_sfnt_off0000f77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77C 10896 bytes
SHA-256: dfa696d1fc5659c19f7106fe727b7d0b3935c542b053e88d66493e425dd8e119

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