Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba2a764ea3bb930…

MALICIOUS

PDF

96.5 KB Created: 2020-11-25 02:27:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea1fa5f052939df3d9ef021231a0f2a0 SHA-1: 563386fc9d5f893604a2d3dd77381ce1d1d189f6 SHA-256: 8ba2a764ea3bb9302a4a880b95b1b355d289b306e7764cbab21d26b6929cd838
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, with one specifically pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external links suggests an attempt to drive traffic to potentially harmful sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://gettraff.ru/123?utm_term=.50+cal+sniper+range
    • https://cdn-cms.f-static.net/uploads/4407996/normal_5fa79fe75b313.pdf
    • https://zajubazo.weebly.com/uploads/1/3/4/4/134452036/kesotik_wedutidi.pdf
    • https://kedumapeba.weebly.com/uploads/1/3/4/5/134593926/a85a58a9d2094c2.pdf
    • https://daxulidotuviwo.weebly.com/uploads/1/3/4/5/134597057/geroziteforexezaxo.pdf
    • https://cdn-cms.f-static.net/uploads/4456128/normal_5fbd8bbfeefd4.pdf
    • https://megogolu.weebly.com/uploads/1/3/4/3/134314378/letuvegujafu_rubakap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ae3e2744-36ad-4558-ad3e-674a6d0bf696/27318086543.pdf
    • https://uploads.strikinglycdn.com/files/bddfe350-40a9-41a2-98f9-4b3a92a693bc/kore_dizi_indir.pdf
    • https://s3.amazonaws.com/rorives/62922327623.pdf
    • https://uploads.strikinglycdn.com/files/934a17b6-16e9-4be9-9a85-03f8b134ff56/ganivagefunalozizo.pdf
    • https://s3.amazonaws.com/jiwisi/77019428763.pdf
    • https://uploads.strikinglycdn.com/files/1693ba1b-061b-4ccb-be74-086d93bf6283/pafumikanujepepala.pdf
    • https://uploads.strikinglycdn.com/files/88b1ba96-a8f2-4b9d-82d2-13ddc56336c3/nefufeposogerunaj.pdf
    • https://s3.amazonaws.com/mijumomub/48139642116.pdf
    • https://s3.amazonaws.com/wizedumi/yuzuriha_unist_guide.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_off00012d4e.bin
557eeaef0c31ac8a1f7d07c9381a5cbe3f17b29477a769905ef1ddcb1c6286ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4E 2920 bytes
font_01_sfnt_off000137a8.bin
4792f9032fecc777e8323aa582805dcc77f9acc1a88ef211dd7097edfe85b7ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137A8 5304 bytes
font_02_sfnt_off000149c8.bin
8ec97124c7c466b22ca3433c1b83ba7786dbfcbce8124543ea38d54648a35a0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x149C8 12976 bytes

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