Malicious PDF — malware analysis report

Static analysis result for SHA-256 853c703fecbd2f32…

MALICIOUS

PDF

75.8 KB Created: 2021-01-20 09:07:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f298bce3b912a55efc15caced176bb02 SHA-1: 7fcdd2fc168aefbf74da331658c3492f4cae625c SHA-256: 853c703fecbd2f32b7ff73ccedb09b6376bcd878b4b3997f0be682255b5026ed
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic identifying one as a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'Foreign miners tax of 1850 document'. The presence of numerous links on disposable hosting and the ML classifier's high confidence score indicate a phishing or redirection attempt, likely to deliver a secondary payload or lead to a credential harvesting page.

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
  • 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.
  • 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=foreign+miners+tax+of+1850+document In PDF document text
    • https://site-1178332.mozfiles.com/files/1178332/mind_readers_reading_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/rumomezojeku/hahMjgx/pixel_starships_wiki_deutsch.pdfIn PDF document text
    • https://site-1176664.mozfiles.com/files/1176664/65960953350.pdfIn PDF document text
    • https://site-1177029.mozfiles.com/files/1177029/gifudagapujagoxemovirikof.pdfIn PDF document text
    • https://site-1193591.mozfiles.com/files/1193591/motosport_phone_number.pdfIn PDF document text
    • https://cdn.sqhk.co/sezogitov/SheeDjf/ball_blast_games.pdfIn PDF document text
    • https://site-1177330.mozfiles.com/files/1177330/92346446391.pdfIn PDF document text
    • https://davugunibelerab.weebly.com/uploads/1/3/4/6/134612729/puwukigixejuwi-wulelogava-savewozoruwuvu-nazabo.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/zabevog/41160630068.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/kevadikamebovomawovolo.pdfIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/sukojinelelufizixinofo.pdfIn PDF document text
    • http://nokakegobowu.epizy.com/tally_balance_sheet_assets_and_liabilities.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/nejamitazotugowowogepuwet.pdfIn PDF document text
    • http://lususexore.epizy.com/fabilivegunof.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_off0000ea0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0F 5844 bytes
SHA-256: 45a7609d2dfc6e76b03949386995ba08f35cb4fe18c48868921706b6ada9ff26
font_01_sfnt_off0000fdf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF3 10624 bytes
SHA-256: fcb603f3e81249721ff760849683c75cf590af7ea7fa77d1c13bfea2e3c66067

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