Malicious PDF — malware analysis report

Static analysis result for SHA-256 70813b4a30def7ce…

MALICIOUS

PDF

72.8 KB Created: 2021-02-25 23:44:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 274ff0bfc840c1e119bd601682cb496f SHA-1: 52ba2eb34386e1ad18449d27c3706c6c018c1b5f SHA-256: 70813b4a30def7ce5086780734d62ef9743ea9837a929f00c1cd316beecb28d9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://druttle.ru/wix?keyword=download+towelroot+v5+apk+2019 PDF link annotation
    • https://cdn.sqhk.co/baxilutifi/gngjic8/san_manuel_online_slot_machines.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475872/normal_5ffb8b3674a9a.pdfIn PDF document text
    • https://wogizirimabote.weebly.com/uploads/1/3/5/3/135337148/monomuxotuk.pdfIn PDF document text
    • https://tijirurilulade.weebly.com/uploads/1/3/4/3/134312421/c8490.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470532/normal_5fc7d34566af5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387411/normal_602b0fd13e4a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461207/normal_60093145861d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408989/normal_5fcdf2976af6c.pdfIn PDF document text
    • http://sajutasure.22web.org/genero_narrativo_ejercicios.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/bjbgfjb/86701318476.pdfIn PDF document text
    • https://cdn.sqhk.co/kulukopupiw/diXVZRy/56795318028.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500883/normal_601141e7361ea.pdfIn PDF document text
    • http://didavixakodix.22web.org/can_you_sell_homemade_food_in_illinois.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zinezalidoratov.rf.gd/wagipukebozekibepi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#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_off0000e582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE582 5596 bytes
SHA-256: b206b0c010eff9530031f1407de3ac056b3d1a81fa371b9a7c459eb497de5426
font_01_sfnt_off0000f8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C7 10472 bytes
SHA-256: 6868a10cecd7b9f733e6f234eac2bd865c7ec95b7d74abd245dc3e4b91245be6

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