Malicious PDF — malware analysis report

Static analysis result for SHA-256 750bf2ca6d655a6d…

MALICIOUS

PDF

108.9 KB Created: 2021-03-29 09:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1cd0e961b303c428a263d69afbb70fb7 SHA-1: 892fa86fd9046f59437120d6f4b595456e4f5342 SHA-256: 750bf2ca6d655a6daa85cc983bb04553e7b08e0c126ffa7c4f0ddd7d55b181ab
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. One of the primary URLs points to a domain associated with phishing and malware distribution. While no scripts were directly extracted, the PDF structure and the presence of numerous external links suggest an attempt to lure users to malicious or SEO-manipulated content, potentially as a precursor to further compromise.

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-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/award?keyword=integral+calculus+application+problems+with+solutions+pdf
    • https://fabuduviwanor.weebly.com/uploads/1/3/4/7/134739750/9923600.pdf
    • http://buxodubofazaki.iblogger.org/chicco_bravo_trio_travel_system_stroller_manual.pdf
    • https://jitijukuvag.weebly.com/uploads/1/3/4/7/134743274/15892.pdf
    • http://melidagerukebel.sportsontheweb.net/xukod.pdf
    • https://komibaxes.weebly.com/uploads/1/3/1/6/131606619/gokos_rapanalisikez_xisobebofov.pdf
    • http://kelimap.mywebcommunity.org/38198025444.pdf
    • https://jumabesabixoduz.weebly.com/uploads/1/3/4/3/134368642/22a5186.pdf
    • http://nogezat.iblogger.org/58418517743.pdf
    • http://zawopim.mygamesonline.org/nojatowawosox.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/patilawasu/ilive_bluetooth_headphones_manual.pdf
    • http://lijowavatajo.myartsonline.com/an_enquiry_concerning_human_understanding_full_text.pdf
    • https://ec5c17a1-061e-4a2c-a9e6-b3561ba71229.filesusr.com/ugd/299074_ffa73e77833748f59b1ec99070213f79.pdf?index=true
    • https://02ee9779-94d6-4ec7-959f-c0f99fe19a35.filesusr.com/ugd/cdc607_f5663f3b74fe4e8ba22954ca7429eff0.pdf?index=true
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_96168b459c6d4309ac47590ce45702e8.pdf?index=true
    • https://s3.amazonaws.com/lokijuronig/92618180750.pdf
    • http://jadivepijuga.myartsonline.com/chromophores_and_auxochromes.pdf
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_d961269319034ad788f468a3f24d89b9.pdf?index=true
    • https://s3.amazonaws.com/vososasoxumete/mikivobaka.pdf
    • https://s3.amazonaws.com/lebejos/mobagimeromex.pdf
    • https://s3.amazonaws.com/wibadinavosunom/online_student_attendance_management_system.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015137.bin
23fa0807beacccf8f4c576d9120079285c9dd3e1975176d0b7c6a32a17e0a7c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15137 5736 bytes
font_01_sfnt_off0001649d.bin
526dc40502a8555a84eaf609041de790072914105d12518d6ea8f3e47ecb967d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1649D 12788 bytes
font_02_sfnt_off000190be.bin
fb10e5badbbf29d6a05184c763452604a6d256f7c208a2bb674868c670b14a78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x190BE 16144 bytes

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