Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9423bd2447b5a12…

MALICIOUS

PDF

69.2 KB Created: 2021-02-20 18:24:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c7051a22815af93d3570a0e7a746e90b SHA-1: c7eb107bf7aa5693e0edb7bfab7c5e1f0f4e24e9 SHA-256: a9423bd2447b5a12750656ed05f9e2090311367224e6bd8f4a88742d95fda909
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of links to potentially malicious domains is a high-priority indicator.

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
  • 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://yafferge.ru/123?utm_term=electric+circuits+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4464065/normal_5fd6837f5f9e9.pdfIn PDF document text
    • http://bestsaleshopin.xyz/programming_language_syntaxpc33e.pdfIn PDF document text
    • http://airet.space/solidworks_tutorialslsabk.pdfIn PDF document text
    • http://gonzo-3d.com/38556594554gtdhy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474176/normal_5fce2cdea3222.pdfIn PDF document text
    • https://cdn.sqhk.co/fofodafexadu/2q6AJzp/absorption_rate_formula_real_estate.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/lowuwofuxali/greeting_card_template_for_diwali.pdfIn PDF document text
    • http://tokipobobanokab.rf.gd/waveloletazez.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/latin_music_usa_bridges_worksheet_answers.pdfIn PDF document text
    • http://vugixemavofagen.epizy.com/apc_1_kva_ups_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/can_you_still_use_an_ipod_nano.pdfIn PDF document text
    • http://ximumipos.rf.gd/35831798350.pdfIn PDF document text
    • http://lewefip.rf.gd/top_books_websites.pdfIn PDF document text
    • http://valamujunitun.epizy.com/89072191680.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD374 4896 bytes
SHA-256: 20449c0902ff00c660ccd292407a8325b64bc235f1d907392b4ced7039564e13
font_01_sfnt_off0000e434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE434 10436 bytes
SHA-256: a08a4334bbe54272caac940262a9f6cd00e8a9174fb2f6d158b9b846d42165b7

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