Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7ccac1227d82fdb…

MALICIOUS

PDF

62.7 KB Created: 2021-01-23 01:10:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 13356bc0ed96a4fd1762d4f50f0b5c18 SHA-1: c6446053f3939595e3d8967c3e7957c827bc2653 SHA-256: f7ccac1227d82fdb6adf3885c13781ebb4da1451b87877763acdbcb17971d15d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous embedded URLs and a heuristic for a 'download button' lure, suggesting it's designed to trick users into downloading a payload. The presence of external URIs and a link farm on disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafftec.ru/123?utm_term=chocolate+cell+phones PDF link annotation
    • https://cdn.sqhk.co/kuruwoke/abhekbx/27716082273.pdfIn PDF document text
    • https://fapusogemewesil.weebly.com/uploads/1/3/2/3/132302858/nexagad_nabujezurupage_fusilogege.pdfIn PDF document text
    • https://kumojazoj.weebly.com/uploads/1/3/1/3/131381946/8f9af420d63.pdfIn PDF document text
    • https://vunisanelebori.weebly.com/uploads/1/3/3/9/133999195/pewiwosegu-wavaviridara-nubalazulu.pdfIn PDF document text
    • https://site-1230881.mozfiles.com/files/1230881/michigan_durable_power_of_attorney_acceptance_form.pdfIn PDF document text
    • https://site-1173612.mozfiles.com/files/1173612/brushpen_comic_lettering_font.pdfIn PDF document text
    • https://digutejuwunapon.weebly.com/uploads/1/3/5/3/135325267/5246406.pdfIn PDF document text
    • https://gogadumipoti.weebly.com/uploads/1/3/1/0/131070618/6032021.pdfIn PDF document text
    • https://cdn.sqhk.co/febenanedibu/dgdcNha/pink_ombre_nails_with_glitter.pdfIn PDF document text
    • https://robigatif.weebly.com/uploads/1/3/0/8/130873787/mofigunujesomum.pdfIn PDF document text
    • https://govexofube.weebly.com/uploads/1/3/1/8/131872198/jatumutexe_xedexawuwumu_dasosixexol_xufokizutiz.pdfIn PDF document text
    • https://bakubirusi.weebly.com/uploads/1/3/4/6/134680497/d721ae29722a.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvexudid/f18BhaQ/dessert_recipes_easy_and_fast_no_bake.pdfIn PDF document text
    • http://jirobanu.22web.org/beautiful_wallpaper_hd_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/dixobiwi/OOhdhb0/27017167265.pdfIn PDF document text
    • https://furedanoduribi.weebly.com/uploads/1/3/4/6/134681858/3577314.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000bd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD10 4828 bytes
SHA-256: c888d838d515344c81b7fe9af1a46a4c15f5dce245c00aa5e2f3e845e53e0d01
font_01_sfnt_off0000cd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD77 9644 bytes
SHA-256: fb201f60b623651567a63c3fb1bbd8053c9f607a62f3fd325e1ade4cd78bdc28

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