Malicious PDF — malware analysis report

Static analysis result for SHA-256 62f1037e3e4ef3cd…

MALICIOUS

PDF

72.1 KB Created: 2021-03-09 11:17:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f618cb16ac03680d30fe1c820dd3f3d9 SHA-1: 7cf0e55ffae440d2939d32cdf9dbd8deedac67ad SHA-256: 62f1037e3e4ef3cd6fba04ec49ab18f4c33d924782f4b5b2a336ee74980ec0e6
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of a large number of external links, identified as a 'PDF_SEO_LINK_FARM', suggests a tactic to distribute malicious content or engage in phishing. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the overall structure and link farm point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/award?keyword=alexander+elder+entries+and+exits+pdf
    • https://cdn.sqhk.co/dofofigeniso/IjblBzt/knight_rider_cast_2008.pdf
    • https://cdn.sqhk.co/nonuripot/rYibEjh/amazon_fire_tv_cube_2nd_generation_model_number.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://05282879-aed3-4f16-ac14-d534add4d4bd.filesusr.com/ugd/0f8b7c_a08863ee16994368bb210ca368d50ccf.pdf?index=true
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_e158dfb138aa45faae2df586044d7a4c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f5b6468b-a000-4c47-b637-b245dc9b8114/how_strong_is_konoha_white_fang.pdf
    • https://uploads.strikinglycdn.com/files/34835814-5f18-4a0e-8f59-7cfe8c61c568/60877808951.pdf
    • https://0f285ee0-1b14-49a2-8a3e-060a2db94812.filesusr.com/ugd/4bf67f_82459fbd762847338f145f05e993880a.pdf?index=true
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_9719693bd3ef40b7b8fe44a191ec8476.pdf?index=true
    • https://5e54d98c-4257-4cc7-9010-48f3df296eb2.filesusr.com/ugd/05240c_66a1be7339ee45f3a00faa1078fba1d0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1dc7a20e-7b17-4519-8322-3809ca24940e/61084221270.pdf
    • https://uploads.strikinglycdn.com/files/3147edd6-67ad-46c6-818c-06be714910dc/pomigobidavanujilevamobu.pdf
    • https://uploads.strikinglycdn.com/files/758c4138-28e2-4794-9582-607079bbbe2b/55806528926.pdf
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_2a633164045c4286bb2e85ddfc69d7a3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/04fd82f5-6449-4190-876f-1e59e8690a67/zonubix.pdf
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_e4589edb7c1e49ce9759f650376c04fc.pdf?index=true
    • https://6b52f5a6-db44-4d3e-8337-ab33c729cb13.filesusr.com/ugd/f4de5e_e09ee18392bf422b96879aff49ac4b2e.pdf?index=true
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_fd28dbdbaf1e41f5bb9977dbd1e83aa3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3697b9cc-59bd-4c6e-bc1b-204b80ecb7cf/53858330342.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_off0000de15.bin
0bebc0229b958b878ae49b535994be3625e116202f9918750c5552a5c849548b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE15 5092 bytes
font_01_sfnt_off0000ef7d.bin
b6f76a88bab740ce6cc5780812f36c3873c275ebbd224dd91a5ba23c11d65379		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7D 10496 bytes

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