Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d26adb8a75d35b…

MALICIOUS

PDF

88.7 KB Created: 2021-03-11 01:56:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af71b7f88c1e5da78d835f634c9c063e SHA-1: f47724ebf04cff04f6c6d410386cb97ab9875d6b SHA-256: c9d26adb8a75d35bb75826cb89d1a874a650671ff86d5bbd9351191fd0ef332a
164 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 other PDFs, indicating a link farm designed to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure itself is indicative of a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/wix?keyword=student+exploration+circuits+builder+answer+key
    • http://didazema.mypressonline.com/software_development_manager_salary_seattle.pdf
    • https://zadobixif.weebly.com/uploads/1/3/1/4/131437920/5796804.pdf
    • https://gitazedekof.weebly.com/uploads/1/3/1/3/131398323/29a539d.pdf
    • https://cdn.sqhk.co/kuderoxuz/dpjjk50/88372485770.pdf
    • https://kefavobora.weebly.com/uploads/1/3/6/0/136010588/bupetil-masafiwo-vebasiparexed-zilanu.pdf
    • https://cdn.sqhk.co/fewoxenovof/hicjcij/lerijadibag.pdf
    • http://betizekaxu.getenjoyment.net/how_to_make_cool_science_projects.pdf
    • https://gosesubamumu.weebly.com/uploads/1/3/5/3/135348433/1384434.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_18cb921acb0b4b90a493d03608aa6ab7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5c39b99b-2550-4c5c-ace9-484cf3011b23/magnum_inverter_remote.pdf
    • https://uploads.strikinglycdn.com/files/787e9ed7-bbfe-4528-8d7e-4fb287db0a56/rules_of_multiplication_and_division_radical_expressions.pdf
    • https://uploads.strikinglycdn.com/files/fad6440f-3f04-4722-87e9-2f7b23dc05e9/20617155713.pdf
    • https://f4b9ed98-44c1-44e6-9966-d9817cd43de7.filesusr.com/ugd/9ced5d_7e049a7271974fd1ae0a60e690c36a19.pdf?index=true
    • http://gajopule.myartsonline.com/93729242978.pdf
    • https://1347de4c-4e54-429a-b84c-372e60bc5a2b.filesusr.com/ugd/6c98bc_93b16b1deaf54fcca52e050351cb38c5.pdf?index=true
    • https://cb73dddc-8872-4e99-b939-d6a5e822a65b.filesusr.com/ugd/c34eac_c6ce30b8234946cb93f2e721eb5ef1cf.pdf?index=true
    • http://xekazaz.myartsonline.com/garmin_uhd_94sv_setup.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_off00010f8e.bin
f3add7d3d5221995adc85a25b222a79dd77f21534ab7430453529fc92aeec461		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8E 5516 bytes
font_01_sfnt_off00012264.bin
438dbcd1c09c13531086552a74595d9f9d7f5f359c7138cd000ae47c67c1d766		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12264 10852 bytes
font_02_sfnt_off00014763.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14763 4324 bytes

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