Malicious PDF — malware analysis report

Static analysis result for SHA-256 12388db3af46abb2…

MALICIOUS

PDF

86.3 KB Created: 2021-03-01 16:23:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c54d3a2d420179222bcc13feaa0b025c SHA-1: 870cbd287e49401e67bd7471b2009d911447093c SHA-256: 12388db3af46abb269ac03e86fe5132a286d27dff92d3366db266896af4b0158
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The 'SE_CLICKFIX' heuristic suggests social engineering tactics designed to trick users into executing commands, likely by presenting a fake error or prompt. The presence of numerous external URIs, including one pointing to 'resalured.ru', further supports a phishing or malware distribution scheme.

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://resalured.ru/strik?utm_term=how+do+you+turn+on+num+lock+on+a+mac+wireless+keyboard PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480412/normal_60215bc83bb3e.pdfIn PDF document text
    • https://cdn.sqhk.co/kixobaza/vBCieBU/fafanujenezedu.pdfIn PDF document text
    • http://obzorov.site/rigiwiwolupanikaxija8agod.pdfIn PDF document text
    • http://help-verifiedbadgecenter.com/xekizuwuxunjfyt.pdfIn PDF document text
    • http://gifinibufenatar.medianewsonline.com/excel_urgent_care_katy_houston_tx.pdfIn PDF document text
    • https://cdn.sqhk.co/dedenijikal/hcnhdie/zibamuvazajubesitijegotuf.pdfIn PDF document text
    • http://creditreportfast.info/hope_all_is_well_with_you_answerywewj.pdfIn PDF document text
    • http://rimka.xyz/how_to_format_sd_card_for_gopro_hero_7_silverpv963.pdfIn PDF document text
    • http://lazirog.mywebcommunity.org/kajuxedagudakapugikeduf.pdfIn PDF document text
    • http://figimumagoko.mygamesonline.org/4142194191.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/gapivegek/aws_certified_solutions_architect.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/aix_6._1_commands.pdfIn PDF document text
    • http://rivenoke.onlinewebshop.net/papofadepiba.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/savakopawowax.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDA 5444 bytes
SHA-256: 85f88f2d04f96e9f298f274168710c9fadec4ce2b102f9d1ca70fad672c9c018
font_01_sfnt_off00011058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11058 11144 bytes
SHA-256: 4f6bff01b0af307d54a242bf851c608bcf887bb278218d4486d737e578fe258f
font_02_sfnt_off0001366e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1366E 16144 bytes
SHA-256: b6a70a9b2162b416300f8b534ecc4449796d2215503f8e525ac9d5d5fca2fe09

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