Malicious PDF — malware analysis report

Static analysis result for SHA-256 db150039590e84c6…

MALICIOUS

PDF

162.0 KB Created: 2021-01-10 00:00:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c8bef2f11182a4c7e289d231874fb3bf SHA-1: 06ea86148e6889c6dba08886db36ac41aa8a9a9d SHA-256: db150039590e84c6c3a85fe38e8c2d7e27c06cef2f269ecf42a613ea1072db8d
192 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffmen.ru/aws?utm_term=brass+in+pocket+tab+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4381289/normal_5f94ab3c557cd.pdfIn PDF document text
    • https://site-1178643.mozfiles.com/files/1178643/fanatical_basketball_mod_apk_1__0__6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393751/normal_5fb92e11b639b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376609/normal_5fc915676061a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413235/normal_5fdb8503e5606.pdfIn PDF document text
    • https://site-1172371.mozfiles.com/files/1172371/free_queen_ringtones_for_iphone.pdfIn PDF document text
    • https://site-1177229.mozfiles.com/files/1177229/agar__io_unblocked_games_77.pdfIn PDF document text
    • https://site-1172122.mozfiles.com/files/1172122/pazuras.pdfIn PDF document text
    • https://site-1173911.mozfiles.com/files/1173911/64296531613.pdfIn PDF document text
    • https://site-1168448.mozfiles.com/files/1168448/free_followers_for_likee_fans_for_like.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486534/normal_5fc92c834cac3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/posufij/lavux.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/zimuwurawudu.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/chinese_restaurant_menu_website_template.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_off00024274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24274 5368 bytes
SHA-256: 7674bb45a1045f6d0ac0606f96769268749c745edc62be8aac1946ce72589692
font_01_sfnt_off000254bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x254BF 11512 bytes
SHA-256: 3f8e3ea8d46507255dbbad25fa8cacc59d0477283b8bb50938eb066a36e944de

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