Malicious PDF — malware analysis report

Static analysis result for SHA-256 b62588206907c19a…

MALICIOUS

PDF

73.5 KB Created: 2021-03-23 00:03:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7636b9a3a37db8c680efdb0aad447bd8 SHA-1: 7547f1680b2f014cd213e8b4c48205c99adf4c38 SHA-256: b62588206907c19a3beee75a4cf36dbf892fb02fe0ad1269ea3230e44103180d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to suspicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs are likely used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/123?utm_term=candida+glabrata+tratamiento+pdf
    • https://jokisutenewaj.weebly.com/uploads/1/3/1/4/131483229/vepowigutawu_supugabowixi_godejipi_rivev.pdf
    • http://ruzalonuxow.22web.org/how_to_get_good_at_sat_math.pdf
    • https://fanonobumoxevo.weebly.com/uploads/1/3/1/3/131384335/rakar.pdf
    • https://menuwenuxunok.weebly.com/uploads/1/3/4/6/134682317/pizotofujij-litabovivuxeruj-wojesufulow-volimafologoga.pdf
    • https://kibolimu.weebly.com/uploads/1/3/4/8/134872751/537b325e04c326a.pdf
    • https://pimimazeso.weebly.com/uploads/1/3/4/5/134523822/1753425.pdf
    • https://wedutigumufezeb.weebly.com/uploads/1/3/4/6/134659425/purigenadivifir.pdf
    • https://buzoraxuv.weebly.com/uploads/1/3/4/3/134366179/sososo-tumikalu-mosula.pdf
    • https://kufidadifijerid.weebly.com/uploads/1/3/1/4/131407945/5271319.pdf
    • https://girisuwudogepo.weebly.com/uploads/1/3/0/7/130776006/fejewalokageda_tavakefomisep.pdf
    • https://sunupukub.weebly.com/uploads/1/3/5/3/135319403/jevuxepuw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/672a0878-916e-46ea-9b8d-5d6b6c586264/nejavosatuludi.pdf
    • https://uploads.strikinglycdn.com/files/e07186b7-1b16-49da-890f-b1174f349232/what_is_the_difference_between_a_marlin_336c_and_336w.pdf
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_f9e0e3bb3653449a9080ac5edfb76161.pdf?index=true
    • https://uploads.strikinglycdn.com/files/be24bf94-9541-4942-9521-c850fa633aae/lidatebuzopixibitoborider.pdf
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_f9f91c72f4b04053843051e0fc4c453c.pdf?index=true
    • http://rawonuruked.rf.gd/adobe_reader_11._0._09_font_packs.pdf
    • https://uploads.strikinglycdn.com/files/280a368e-8611-4bec-9213-31c7fa87c138/what_are_the_similarities_between_virus_and_bacteria.pdf
    • https://cff07a16-13b2-455b-8a78-148a75b158b4.filesusr.com/ugd/cda0c7_12c26676ba814772a043b69109c5708f.pdf?index=true
    • http://xiburebejevikom.rf.gd/77661249761.pdf
    • http://femejuzi.epizy.com/gebisokekinurid.pdf
    • https://uploads.strikinglycdn.com/files/67417e26-a55e-4cbf-9023-5e38ee9e6c8f/how_to_fix_fuzzy_brain.pdf
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d35e.bin
c2eb21757437c88b70e5dbc69bffcd8bdc549c0a926afc6b9894889c4bdc2121		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD35E 5132 bytes
font_01_sfnt_off0000e4b2.bin
2b52fe980d2ec83f6ef5dd738120c1c0097c8b2c773b39319f65809076769cab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B2 11020 bytes
font_02_sfnt_off00010907.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10907 4324 bytes

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