Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5e34f92d512886…

MALICIOUS

PDF

74.5 KB Created: 2021-02-14 17:22:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9a6dc04215d663aa171291724a45de0d SHA-1: dbccc43b30eb001212caf58dff4baf4765233032 SHA-256: de5e34f92d512886832f6ea52dad214baa2b865945649b1b2505abc43b17bf1b
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/123?utm_term=pattern+seeking+animals+review PDF link annotation
    • http://likelid.xyz/86587058131vl0n9.pdfIn PDF document text
    • http://onsideball.info/vowulepos5vo9q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380692/normal_5ff7a70d5d321.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/hi5jjgc/todolist_react_example.pdfIn PDF document text
    • http://fsfsfd.xyz/230543579297oslp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443371/normal_5fe84934383ae.pdfIn PDF document text
    • http://whitetwo.space/crazy_games_zombs_royalee5tev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413976/normal_5fcb64af5bd37.pdfIn PDF document text
    • https://cdn.sqhk.co/tijatabov/VhcA2wB/jezejodatugesinowomadiron.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470835/normal_5fe7b4884ce55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464702/normal_6011c3922cf23.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408004/normal_60005d2ff0846.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444123/normal_6015a591ba21a.pdfIn PDF document text
    • http://detonic-ro.website/83453478983p2dzm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366011/normal_6012de07931d5.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/gozilum/blackberry_link_for_z10_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/aiou_challan_form_for_reappear_in_workshop.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_off0000db5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5E 4900 bytes
SHA-256: d362e8fccbb8b4176ad105326b55dffb14a04c2854f95de5cefe25efac5a8ae2
font_01_sfnt_off0000ebf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF1 10240 bytes
SHA-256: ad55449abfa8e971ada97ef1f638d8666b55cd51f729e4e7df5643779fec5185
font_02_sfnt_off00010ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF8 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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