Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbf4f950784d72d0…

MALICIOUS

PDF

72.2 KB Created: 2021-03-23 22:29:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a7084e1915a43ddabad1e8422860ff2 SHA-1: 502722c534c32a99e00ee1d0cc9a4a1bc76c5a65 SHA-256: fbf4f950784d72d074eb00d1285a61a748d5b07ea4b5f44dcddcbe49f873ce5b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to Weebly and sqhk.co domains, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO manipulation. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/wix?keyword=go+go+plant+2+unblocked
    • https://dufofumiwiz.weebly.com/uploads/1/3/5/3/135309849/tudutitigat_vukujuluxudava_kilovuvudid_faworeramawogo.pdf
    • https://vajibenutiw.weebly.com/uploads/1/3/4/4/134487234/5588489.pdf
    • https://cdn.sqhk.co/liregevo/ihjgxlO/24589602777.pdf
    • https://cdn.sqhk.co/maxokekoxo/xPhg8je/descargar_biblias_antiguas_en.pdf
    • https://risixugetiso.weebly.com/uploads/1/3/5/3/135317557/000069.pdf
    • https://cdn.sqhk.co/dijowasedop/hcjbjeR/66180720948.pdf
    • https://wuvumivew.weebly.com/uploads/1/3/1/4/131410662/587194.pdf
    • http://xejopegig.mypressonline.com/moon_of_the_caribbees_text.pdf
    • https://gawotajar.weebly.com/uploads/1/3/4/5/134525297/durile.pdf
    • https://cdn.sqhk.co/mafozerekat/AgjiaKQ/slice_of_life_meaning_by_larry_alcala.pdf
    • https://cdn.sqhk.co/rurokusulos/cDMhf5x/jury_service_excuse_letter_template_uk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://48e4e0df-78ce-4736-8797-27735e68dc67.filesusr.com/ugd/f3b179_b48e7dbd4a6e4e2f9e5f3ab4bf717b2a.pdf?index=true
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_5122edcb7d6241d0b3c00daa2d451309.pdf?index=true
    • https://s3.amazonaws.com/folexapurilowe/how_much_do_nutritionist_make.pdf
    • https://s3.amazonaws.com/gekixadonuru/honeywell_wireless_doorbell_battery_replacement.pdf
    • http://tofilijewok.atwebpages.com/queen_bohemian_rhapsody_piano_partitura.pdf
    • https://s3.amazonaws.com/minegikukovel/17643008999.pdf
    • https://s3.amazonaws.com/xepululejiwof/mobile_app_templates_free_html5.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_off0000dd33.bin
507c24a9cc134d0b00f815ea45cc058ffd065ba2daea0195bdd9975e7563a326		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD33 5332 bytes
font_01_sfnt_off0000ef6e.bin
3d7728c6bef23042dfe6b9de34c2d8de83e8507462d633f61872187d1dfb53de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6E 10704 bytes

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