Malicious PDF — malware analysis report

Static analysis result for SHA-256 b50805cca65811e1…

MALICIOUS

PDF

80.1 KB Created: 2021-02-25 16:54:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce41976ee3b2c67e9c6301585f247c49 SHA-1: 2f119f415720bec9fad1aeb2f3433f7e83c6f284 SHA-256: b50805cca65811e1113997fc0339fbd9a0123e4d84247477e1a9402f1fca6cf0
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing indicating a redirector to known malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing or redirection attempt, likely delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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.
  • 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://yafferge.ru/aws?utm_term=public+health+psychology+salary
    • https://static.s123-cdn-static.com/uploads/4415768/normal_5fde122198acd.pdf
    • https://static.s123-cdn-static.com/uploads/4390637/normal_5fee3da0de2d6.pdf
    • http://pipabineki.22web.org/bixurinenu.pdf
    • https://cdn-cms.f-static.net/uploads/4454807/normal_602e1525df212.pdf
    • http://lajulufubugo.22web.org/vujebefevex.pdf
    • http://ludozikime.22web.org/tadobagipumatonawo.pdf
    • http://gifawel.22web.org/mafabedobenopudatoveme.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lezopobigeza/kurinivizegoziru.pdf
    • https://s3.amazonaws.com/gurowozenupifi/98506965523.pdf
    • http://mapoler.epizy.com/body_systems_diagram_worksheet.pdf
    • http://nidalekunipu.epizy.com/47991790448.pdf
    • http://xerozovurewafok.epizy.com/fantaisie_impromptu_sheet_music.pdf
    • http://natexaz.rf.gd/zalome.pdf
    • https://s3.amazonaws.com/lijopavexanuse/autodesk_fusion_360_size.pdf
    • http://kewivawegimomu.epizy.com/analyzing_primary_sources_worksheet.pdf
    • http://dujenovonufu.epizy.com/16197053719.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb02.bin
f7d3e773dc8cce88f0be00525047fd4a33a7e26ed6a925046a7284a75abe06c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB02 5440 bytes
font_01_sfnt_off00010d7f.bin
ba6a87a662f6e2ba0e962bbafbabbc1d3232fdc5542650984f2f702fbe4c5e42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7F 11080 bytes

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