Malicious PDF — malware analysis report

Static analysis result for SHA-256 904d3a330d56da0a…

MALICIOUS

PDF

74.8 KB Created: 2021-03-31 20:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: cb06c0a0356002a77f6125222b9e4b4e SHA-1: d68cf7c4a5e03390e32c159bc482069d417d8355 SHA-256: 904d3a330d56da0a89082acbb34e968087c37d334275d3ee4a3b56bb2ec82338
166 Risk Score

Malware Insights

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

The PDF file is identified as malicious by multiple heuristics, including ML classification and ClamAV detection. The 'SE_CLICKFIX' heuristic indicates a social engineering attack that instructs the user to press Win+R or paste a command, likely to download and execute a secondary payload. The embedded URL points to a suspicious domain, suggesting a phishing or malware distribution attempt.

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://bologen.ru/strik?utm_term=windows+shortcut+to+capture+screen PDF link annotation
    • http://zegosuvavanow.22web.org/reasoning_backwards.pdfIn PDF document text
    • https://saxurugilura.weebly.com/uploads/1/3/2/8/132814125/jurub-dolalujarobib.pdfIn PDF document text
    • https://wafulezejo.weebly.com/uploads/1/3/4/7/134748518/2339368.pdfIn PDF document text
    • http://popibiku.22web.org/antihistaminicos_y_lactancia.pdfIn PDF document text
    • http://zawopim.mygamesonline.org/acls_algorithms_heart_and_stroke.pdfIn PDF document text
    • http://vixerixobo.22web.org/kijofobidogurekofaf.pdfIn PDF document text
    • http://wivikaxebox.medianewsonline.com/ear_acupuncture_book.pdfIn PDF document text
    • http://palupalukagu.mygamesonline.org/pejaxarewovumalepoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_6e9a8fcf31074af3b8024f1488e50328.pdf?index=trueIn PDF document text
    • http://lakonupinazuj.rf.gd/wood_grain_vinyl_sticker_sheets.pdfIn PDF document text
    • http://puribisipup.atwebpages.com/94767464215.pdfIn PDF document text
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_090bbea12b824271b8bde441d7d9b25a.pdf?index=trueIn PDF document text
    • http://kifozelig.epizy.com/vufumosorazagogurumuguxe.pdfIn PDF document text
    • http://mutidulofof.epizy.com/dalwood_spelling_test.pdfIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_568beb01d2a64fd0a0f3f3b34c510ec8.pdf?index=trueIn PDF document text
    • http://puzenufamem.rf.gd/how_to_connect_motor_siren.pdfIn PDF document text
    • http://setiwol.epizy.com/jixuxawesugotewusuk.pdfIn PDF document text
    • http://lipeporo.onlinewebshop.net/advanced_life_support_in_obstetrics_also.pdfIn PDF document text
    • http://rifimazagajide.epizy.com/71519263710.pdfIn PDF document text
    • http://kejibawiluxo.epizy.com/rubovugovolijezipeleruker.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_off0000e819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE819 5236 bytes
SHA-256: 05204fc652745172f70686c297ecdc0042dd332a52019c5d3df8691970fe6775
font_01_sfnt_off0000f9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FA 10568 bytes
SHA-256: 312453de436154ec637c10ec121b0db25c63f141cb6281d9f54d0a4e77474e02

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