Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f5fe1ee30b36b63…

MALICIOUS

PDF

78.0 KB Created: 2021-02-08 04:10:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 290e2b1a939634beef276a5e5c7ed12d SHA-1: 3348543d67cd4c490073610a4c8d9229d720924b SHA-256: 5f5fe1ee30b36b63d17ee5bac0e012da248c54458679dc396d185ca106a2e8a2
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'American civil war advantages and disadvantages', likely a lure to disguise the malicious intent. The presence of numerous links on disposable hosting further supports a phishing or redirection scheme.

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/123?utm_term=american+civil+war+advantages+and+disadvantages In PDF document text
    • https://cdn.sqhk.co/voguzasijur/B2egerS/zombie_gunship_survival_unlimited_gold.pdfIn PDF document text
    • https://cdn.sqhk.co/bodovukig/mSjajhn/mavekupatigu.pdfIn PDF document text
    • https://dixoparogazasa.weebly.com/uploads/1/3/1/8/131871726/496140.pdfIn PDF document text
    • https://munowimil.weebly.com/uploads/1/3/1/4/131406650/82b2cfc.pdfIn PDF document text
    • http://vienvozvrat.site/applied_partial_differential_equationv0ps.pdfIn PDF document text
    • https://cdn.sqhk.co/bonosexov/fVgEIic/kodix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411252/normal_60015d97cf874.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwufupi/MRzjbTK/rc_off_road_tires_for_sale.pdfIn PDF document text
    • https://sepuvoguzunisam.weebly.com/uploads/1/3/4/4/134488558/deketuxarigifixom.pdfIn PDF document text
    • https://dapunilak.weebly.com/uploads/1/3/4/5/134506399/162d8.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/jinabisura/sinowavafofolezov.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/dark_wallpaper_android_4k.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/bitmap_to_byte_array_android_xamarin.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/ground_sheet_for_inside_tent.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/yahoo_mail_for_desktop.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_off0000e859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE859 5076 bytes
SHA-256: 2776fb30601dfb9e89437f655ed61e56a36eecf83db0ced29485ef735522301f
font_01_sfnt_off0000f986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF986 10176 bytes
SHA-256: 07be5ff9273beede429f26a537ea8c70e3dc4a1b4468d9f1c81d82a6894c2143
font_02_sfnt_off00011c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C20 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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