Malicious PDF — malware analysis report

Static analysis result for SHA-256 75e3d37caca08560…

MALICIOUS

PDF

82.6 KB Created: 2021-03-19 04:02:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c67ec90bf752592e93040134de1f38d SHA-1: 11a946e764c99ed00872ef1aaffa2e96e7b236bd SHA-256: 75e3d37caca085604dfac42d612574476928cf648b7ccea6b2d8441158aa62c0
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, a common tactic for SEO link farms and phishing. The presence of a PDF_SEO_LINK_FARM heuristic firing and multiple unknown reputation URLs strongly suggests a malicious intent to redirect users to potentially harmful sites. The ML classifier and ClamAV detection further corroborate the malicious nature of this file.

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=best+astrology+chart+app+for+android
    • https://mevinabepoke.weebly.com/uploads/1/3/2/7/132740553/5147299.pdf
    • https://jaweditulopo.weebly.com/uploads/1/3/4/3/134313576/8964d.pdf
    • http://wevotimojek.22web.org/product_of_two_multivariate_gaussians.pdf
    • http://tipofeliluget.medianewsonline.com/gexufivaxu.pdf
    • https://cdn.sqhk.co/nozedimasav/1ji2U4t/denodekoxeweleb.pdf
    • http://vovadot.22web.org/51851955405.pdf
    • https://lulegosepo.weebly.com/uploads/1/3/0/9/130969478/9498398.pdf
    • https://cdn.sqhk.co/busekonel/jnSrWge/bar_graph_worksheet_grade_2.pdf
    • http://rolapisi.scienceontheweb.net/esoteric_bible_interpretation.pdf
    • https://rajopolaxobi.weebly.com/uploads/1/3/1/4/131406270/668424.pdf
    • https://pevusipifo.weebly.com/uploads/1/3/4/8/134863194/322497.pdf
    • https://cdn.sqhk.co/tebefaravuz/bgcigho/banorok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/04739472-8755-45dd-bf77-64bfbdd1ab33/4x-5y160_and_2xy-60_samikaran_hal_kijiye.pdf
    • https://uploads.strikinglycdn.com/files/6e299ebb-d4bd-40b3-b8fd-23a112db0bb5/apc_smart_ups_x_1500_battery_replacement.pdf
    • http://vogumogut.epizy.com/24055115237.pdf
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_badda42e34004ca69e67afd0c191cf3e.pdf?index=true
    • http://zogadawedalifap.onlinewebshop.net/payroll_management_system_project.pdf
    • https://12350a4d-732a-4148-85a7-4fa27f2a77ec.filesusr.com/ugd/17beed_70a815e817204798996b53a0f1ded429.pdf?index=true
    • http://zoloxufiz.epizy.com/hyperion_workforce_planning_administrator_s_guide.pdf
    • http://fijonomun.rf.gd/bluejacking_abstract.pdf
    • https://uploads.strikinglycdn.com/files/81b6d106-13b3-4e3c-a289-e743eca1da4b/52109022702.pdf
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_4895d8f7041141ca9e285e06c5311774.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bde6facc-e858-4133-8380-db1b7ee82b3a/15335595078.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102bc.bin
9c6402abdeb0059c6df7ab27d72b2acc31a29e13f670004839388f1e2e541601		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102BC 5568 bytes
font_01_sfnt_off000115b1.bin
ffa701fcf092a2caaebb613068c9b568489783f39a45d9650db1ddd1cbd60b8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115B1 11436 bytes

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