Malicious PDF — malware analysis report

Static analysis result for SHA-256 d08d390840e243f7…

MALICIOUS

PDF

79.5 KB Created: 2021-04-03 00:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42c9a009c655594440f21b1a51b0e33d SHA-1: d1e41695a0e8acacb7a1caf11ef1c01108ee964a SHA-256: d08d390840e243f7b5b160aa2cc9031cb8dbc4dce053309670595eef5d87478b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://botokaw.ru/award?keyword=total+coliform+bacteria+pdf
    • https://wawupibinotab.weebly.com/uploads/1/3/4/9/134900246/vubufinaxawe_resasag_kevesajogivoma.pdf
    • https://cdn-cms.f-static.net/uploads/4374522/normal_6067867389def.pdf
    • https://cdn-cms.f-static.net/uploads/4408586/normal_601f2f3c1df22.pdf
    • https://static.s123-cdn-static.com/uploads/4413369/normal_5ffb858375f72.pdf
    • https://cdn.sqhk.co/wekaradukuve/jiNudcI/the_sims_mobile_mod_apk_and_obb.pdf
    • https://sotemupavunu.weebly.com/uploads/1/3/1/4/131413148/liloferepapoziwikej.pdf
    • https://degijidugaf.weebly.com/uploads/1/3/4/8/134886203/lilata.pdf
    • https://cdn-cms.f-static.net/uploads/4474985/normal_605709c795633.pdf
    • https://gafetugifepes.weebly.com/uploads/1/3/2/7/132740982/5839202.pdf
    • https://cdn.sqhk.co/xexogataza/Lc1gghf/gipulalusidesixesamawak.pdf
    • https://pesasujax.weebly.com/uploads/1/3/4/8/134882000/8719228.pdf
    • https://cdn.sqhk.co/zatovafer/haoRxgd/dunkleosteus_terrelli_size.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c207dc97-0cc9-441e-8caf-a702c1639d46.filesusr.com/ugd/36abe8_04f360fee4a640628f271e8981a7879a.pdf?index=true
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_7c5893f8fabe4d5bbc0c9e2c28de003a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/11abad4e-6b45-48a5-b1fe-5146e5965dbb/whirlpool_quiet_partner_3_heating_element.pdf
    • https://uploads.strikinglycdn.com/files/36009d47-9503-4eb0-9f20-8925399a68e2/28321242718.pdf
    • https://uploads.strikinglycdn.com/files/098f81db-55af-46b7-a744-2e3d7214a622/list_of_conjunctions_in_english_and_spanish.pdf
    • https://dc383e6d-b7a3-4e67-a88a-227fa542b6c3.filesusr.com/ugd/72b0e7_9c6b90aca9744fd1827d38fac0a3b069.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cee008a5-12f6-451e-a6e3-3f429f2472ce/carlton_and_perloff_modern_industrial_organization_4th_edition.pdf
    • https://49b821e7-ee7e-41b4-809b-d0417b8c1ddf.filesusr.com/ugd/927743_8e69a3a2e56d4ed3b21a7c5f3180dec0.pdf?index=true
    • https://30fe55a9-f0c7-4aec-9bf5-b9d2225d99a8.filesusr.com/ugd/c4a51e_6d439c13ef8e4bf7adc8660118da96d8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fce3f5b7-8cfd-4e5a-a7b8-cb8a6683c09f/27748657119.pdf
    • https://cd489911-dc6d-4439-b408-84622343fb93.filesusr.com/ugd/d8e941_19b5c7103a2844f39689322380400a14.pdf?index=true
    • 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_off0000f939.bin
4706aac4fed31f3440b4d0529579a496732f7dbc5d13456ce1cc18ecdf58854e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF939 5212 bytes
font_01_sfnt_off00010ad6.bin
e2e8424eb02681936ddb021b60a0d9da7c5c03aa9883ac73704c3c060471fb23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD6 11160 bytes

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