Malicious PDF — malware analysis report

Static analysis result for SHA-256 470e376e901a0346…

MALICIOUS

PDF

95.5 KB Created: 2021-05-07 10:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8dee65c9f03979dddbeef12f026689d9 SHA-1: 26687129aa2048152957d79890ab648027c6e34d SHA-256: 470e376e901a03466d64f8a888b9c53e49577adbbbb9e1a05080dbcb4541ec21
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with the primary suspicious URL being https://seumenha.ru/strik. This heuristic, combined with ClamAV detection as Pdf.Phishing.Trojan, strongly suggests a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate the intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=bluedio+t7+review+espa%25C3%25B1ol
    • https://jedunifoxawixe.weebly.com/uploads/1/3/4/4/134458330/7840648.pdf
    • http://vexoxem.scienceontheweb.net/mabagera.pdf
    • http://kojijeku.mygamesonline.org/23859473507.pdf
    • http://kopogaxepaku.sportsontheweb.net/asteraceae_classification.pdf
    • http://fajesamosini.sportsontheweb.net/structure_and_function_of_aquatic_ecosystem.pdf
    • https://xopozutafedas.weebly.com/uploads/1/3/1/4/131453480/vodatimujipako-mikuwufetomem.pdf
    • http://figejewumoposes.getenjoyment.net/lakepolunozutodarir.pdf
    • http://xepelewatelaziv.getenjoyment.net/how_to_unlock_an_lg_stylo_3.pdf
    • http://mesikigodijope.mypressonline.com/wibevadamavovuti.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_7dabf485eb9e4b7fbbd175ab15fccde6.pdf?index=true
    • http://netomadutimafe.onlinewebshop.net/ragudonemuserita.pdf
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_c6beeccd708a4a56a7eb9ad3d2359316.pdf?index=true
    • http://medazupu.onlinewebshop.net/esercizi_genetica_zanichelli.pdf
    • https://05491ccc-77c7-428b-9c25-74f2c6c50d4a.filesusr.com/ugd/d51d36_2facc546971c47b8af1ed7a33f2f2f44.pdf?index=true
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_35190f48d2bd461abe82691b9b5f75fc.pdf?index=true
    • http://madepadejatutof.onlinewebshop.net/behavioural_science_textbook.pdf
    • https://b5c4f4dd-ae1f-4f6a-908c-f463551224e4.filesusr.com/ugd/dafd60_a8028e402866456693d1485056523ea1.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff92.bin
09b981dead69ea2fc3147a4e96231bb210a8b467afb5cc29064ba1dffec7bc11		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF92 6616 bytes
font_01_sfnt_off00011032.bin
e79a9337f3b7815a04acd554971f8ca8df9ed8ff3f361b7a3407cafed0a11b14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11032 5448 bytes
font_02_sfnt_off00012297.bin
4bb6aefb075e9de8ead62a2cbed9bea7b1e3c07591d3dd13e31597109a5b9eb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12297 3380 bytes
font_03_sfnt_off0001307d.bin
ed0bc860a83eb6d1734ed761083738e01d03a2d244f4ac4d03c6420195b2a846		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1307D 12304 bytes
font_04_sfnt_off000158eb.bin
f8e326b96df6c0457890c6346fd7f60b91beb129051a642dbd03fdf119a21fd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x158EB 16116 bytes

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