Malicious PDF — malware analysis report

Static analysis result for SHA-256 34a90ff17aea6c59…

MALICIOUS

PDF

84.6 KB Created: 2021-03-24 23:35:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84b255563db3f8eb46577ba8fe96753d SHA-1: 7ad6ce7be4e9eaa0092d787fee34c278ee249ef3 SHA-256: 34a90ff17aea6c598db55681ccc0b268fff38b3dbe5a0558777a5b84d17a0786
156 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one prominent URL pointing to a suspicious domain. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'computer ergonomics pdf', likely to trick users into visiting the linked malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/123?utm_term=computer+ergonomics+pdf
    • http://usblighter24.site/what_order_do_the_warrior_cat_books_go_intcl1c.pdf
    • https://cdn.sqhk.co/delinilipo/hbjhxgj/71199642471.pdf
    • http://ig-verifiedsbadge.com/balint_syndrome583dq.pdf
    • https://cdn.sqhk.co/nilesatu/fhbRNhb/17535699751.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/5866d173-242d-4b9c-9732-b6e239b0c19b/12741044764.pdf
    • https://uploads.strikinglycdn.com/files/9943114c-caea-4458-9f8e-1d1916f0328d/dokiladewemonop.pdf
    • https://uploads.strikinglycdn.com/files/7e43b8dc-5df5-48e8-b301-a4f38ee6dcb5/how_to_reset_polk_magnifi_soundbar.pdf
    • https://uploads.strikinglycdn.com/files/783e21a6-8d64-4a0a-b411-beaeb19fa1c4/zavupuk.pdf
    • https://uploads.strikinglycdn.com/files/3e7edae5-dcfd-4d84-82d0-fcfca769e82b/how_much_does_it_cost_to_have_a_book_spiral_bound.pdf
    • https://4f870d4f-701c-4ec6-bbb3-7277acc5528a.filesusr.com/ugd/fdcb8d_a7ee0e347806455db950ddc0402cfebd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/13a06921-e63b-4739-b2d2-6615d9590b4a/99167268375.pdf
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_c6cb0f32118743929479341337945cea.pdf?index=true
    • https://uploads.strikinglycdn.com/files/69a1eb04-7f11-47f6-af04-9c29117472d0/wovimu.pdf
    • https://uploads.strikinglycdn.com/files/1349c573-c509-43bd-ac23-44a3c38295fa/sears_kenmore_dryer_repair_help.pdf
    • http://daxizupalapa.rf.gd/fiwujatudifuwuvejeluw.pdf
    • https://8c805f22-5240-4a8e-9b4d-8499607ff1fc.filesusr.com/ugd/76156b_22aeb9a97e0f46838825f7e7577cce4c.pdf?index=true
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_7609da35034444778aa98c37ccb2c2e4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/39fbb1ab-47b2-4773-80d9-df1dfe38f066/what_is_the_best_3000_watt_inverter.pdf
    • http://jidowadosul.epizy.com/mechanisms_of_cardiac_arrhythmias.pdf
    • https://uploads.strikinglycdn.com/files/364108b4-d4fb-4052-982c-4c8d746cd5e1/spay_and_neuter_for_feral_cats_near_me.pdf
    • http://temomel.rf.gd/zuramixuzuzujolu.pdf
    • https://medlineplus.gov/ergonomics.html
    • 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_off000101e5.bin
41b5f00effeef6524dd9ed5c718741f1c2f6ac6e380dcb0bbe16978846f120f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101E5 5136 bytes
font_01_sfnt_off0001134f.bin
3ffcad76bb7038db822d6d3fcfd46b7478a724dcee36ea2d8ff61a57aae11cdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1134F 10428 bytes
font_02_sfnt_off000136d0.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136D0 4324 bytes

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