Malicious PDF — malware analysis report

Static analysis result for SHA-256 d00c6b451e4a23b6…

MALICIOUS

PDF

74.4 KB Created: 2021-01-06 03:38:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: f4c45af6ae40a5ec952bde7f936b6604 SHA-1: 5a27222519318ea62d75e9b72fb935d194ccf1bc SHA-256: d00c6b451e4a23b6bafb3fe4206be6c3d5f254970225af33c472fbec338ced78
214 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains embedded links, one of which points to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to 'alphabet pictures for each letter pdf'. The presence of multiple external PDF links indicates a link farm or redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://traffmen.ru/aws?utm_term=alphabet+pictures+for+each+letter+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367941/normal_5fdc0212ccce5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423430/normal_5fd9bcb9d2998.pdfIn PDF document text
    • https://golosoruxo.weebly.com/uploads/1/3/4/3/134339442/9d3736d0baf31b3.pdfIn PDF document text
    • https://vuvajufuzuno.weebly.com/uploads/1/3/4/4/134480129/6340217.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482027/normal_5fbb8d8d97ca6.pdfIn PDF document text
    • https://mivuwapirodi.weebly.com/uploads/1/3/2/6/132681474/xubewufi_bekujosemosukog_wifilibid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcf0dc96-39ac-49b5-8e45-20b200886b02/soturo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be33e675-f4aa-4d2d-89d5-f082881a4be3/44305893001.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e5d61c7-e96f-4c7b-a782-1486ee071045/29895938047.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/mixirepif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88386a18-ab4d-4724-bce6-c0ff6c3438eb/8467969163.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e06a7eb4-1b6e-49a9-95ed-4afac54edb10/stickman_rpg_complete_hacked.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/kodajusanexe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c0d77f0-9082-4281-bb78-cd101539bd2c/aprilaire_humidifier_control_manual.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC64 5372 bytes
SHA-256: 8c5a439b73597b2db941e73ce00b0ebdddeb74deff536792e49dc7b2af4d1fc2
font_01_sfnt_off0000ee93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE93 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off0000f721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF721 10820 bytes
SHA-256: 3f57b4103d44a203b3957810a873d6021bce887e61a42d958a0d04da633e7afb

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