Malicious PDF — malware analysis report

Static analysis result for SHA-256 38aa69dc2e5ee4af…

MALICIOUS

PDF

81.5 KB Created: 2021-05-01 20:40:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2bf6719db01f6eb700c707c06323efff SHA-1: da5770f096c9945508303d09fe65dcedc875c833 SHA-256: 38aa69dc2e5ee4afb801d193ae1f4c6eb9392c33752da391d50865c648adcf3c
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 0.9998

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
  • 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://dafemum.ru/strik?utm_term=dusk+of+dawn+summary PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4463277/normal_5ff9336a702f9.pdfIn PDF document text
    • https://cdn.sqhk.co/zetoreli/4yjfRjg/migobozetasifureje.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458854/normal_5ff904b1f1801.pdfIn PDF document text
    • https://cdn.sqhk.co/bejomewuv/jiBhdii/the_ordinary_serum_dark_spots_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402520/normal_603b169c3b75d.pdfIn PDF document text
    • https://cdn.sqhk.co/zigimovovu/hbjehfk/puzofutekebulusexuxi.pdfIn PDF document text
    • https://cdn.sqhk.co/nutewakizi/8hfrhbC/entrepreneurial_mindset_book.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a4acf42-9c0b-45b9-80ad-bd7ee560646b/how_to_rappel_out_of_a_helicopter_gta_v.pdfIn PDF document text
    • http://nujemapamonaj.epizy.com/66195213711.pdfIn PDF document text
    • http://mafixatoje.epizy.com/wagezalo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64e6b4ca-81b6-4927-b125-def6d5cf49d4/mojusilojudosepefewolezuk.pdfIn PDF document text
    • http://wijogural.epizy.com/bharat_movie_song_djjohal.pdfIn PDF document text
    • http://gelepovasogadax.epizy.com/32003656979.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91a2b788-59c9-485d-9601-78fd3ffdd9ca/echo_pb_250_leaf_blower_carburetor.pdfIn PDF document text
    • http://pufawalaxovosi.epizy.com/antrenmanlarla_geometri_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbca2037-a02f-40e6-8f4f-dedda722c0ed/74192140766.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/666d227a-bcd4-4a69-bd7b-7196ee60fdfa/2003_dodge_durango_4.7_lift_kit.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_off00010145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10145 5276 bytes
SHA-256: da6999ba42c8c3ee4c457e2e73102354ec9f119bd184c5d512c0df54fee0cbb3
font_01_sfnt_off00011346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11346 11008 bytes
SHA-256: e78d60fb2db35eed4d500eda296e9ddd4c80b4a8a9d53f9c4fb67032c64c0f5a

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