Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d74ec7fdc97aeb8…

MALICIOUS

PDF

81.0 KB Created: 2021-04-09 16:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ffe7a6e6277465339183dd9c0a9abde2 SHA-1: 5943991cbaabc8d01148b69793fc83ea9524d8ad SHA-256: 1d74ec7fdc97aeb83a5b796088aac68e83b2e877b150c24b3cbd0a454feb5147
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/strik?utm_term=a+doll%2527s+house+pdf+with+page+numbers PDF link annotation
    • https://kuzosilu.weebly.com/uploads/1/3/2/8/132815793/zutagunowisazufo.pdfIn PDF document text
    • https://piberarejini.weebly.com/uploads/1/3/5/3/135332679/rokuwanuvivet.pdfIn PDF document text
    • https://zusamazoboxo.weebly.com/uploads/1/3/4/5/134527389/dbe17a.pdfIn PDF document text
    • http://sarkife.site/how_to_write_a_reflective_essay_examplesln90f.pdfIn PDF document text
    • http://wiinorama.space/57040407109gplsq.pdfIn PDF document text
    • https://pozemake.weebly.com/uploads/1/3/0/7/130776760/xelizixusevof.pdfIn PDF document text
    • https://towimoni.weebly.com/uploads/1/3/4/3/134340956/mokivizulodobekilo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://9a1eab6f-da2d-4a41-99bb-18a59f11b130.filesusr.com/ugd/c2b690_a1971a6c60284c7f920662b0ac42cf9f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/ax_2012_costing_sheet_setup.pdfIn PDF document text
    • https://c31d65df-273c-4bcc-acfb-7b03b0724b99.filesusr.com/ugd/e7e4a0_130907bd57dd4c8e9820ce8521e52f53.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/4159128166.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9cdc353-ffb9-43cc-b050-92517d64888a/how_to_make_your_own_forex_strategy.pdfIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_de614d43b5e9404c8e72c7d20e61625a.pdf?index=trueIn PDF document text
    • https://b3079848-b07e-4d89-9244-05dfa5dd91fe.filesusr.com/ugd/3ab5ed_58de4ed5a08a4abca3367ef6c030f1b9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a909ab3e-bb56-4292-9176-585fac7a1f2a/que_significa_autorun_en_computacion_byte.pdfIn PDF document text
    • https://849bdae7-2456-4570-9e2a-fc769e7e49ad.filesusr.com/ugd/2074c9_a9881a9fbc054b38b578886f768c0f56.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vefagotoje/porter_cable_dovetail_jig_4210_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d55c217e-19d9-4a39-bdbf-2517b177e39a/navy_seals_symbol.pdfIn PDF document text
    • https://dcd55a6f-f4d9-4ab7-9ea0-0dac4ffa5d6f.filesusr.com/ugd/f7cbe4_6ccc4fa193da44428f6b7198e4979faa.pdf?index=trueIn PDF document text
    • https://510adc33-753b-44c0-977e-8d34da8fcdd4.filesusr.com/ugd/5f4192_94ba44d7c7534ba58f08aa79d5fbd4ee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nojemi/windows_10_32_bit_compressed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f20a2dd6-ce49-4f82-aebb-2e6fe674553a/83182812470.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_off0000f0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C5 5592 bytes
SHA-256: 92f5cd23836b7599aa53e2dd653a947b3a7a6de88f03343da7c429b745bad342
font_01_sfnt_off000103b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B0 10576 bytes
SHA-256: dac0df54fa91f065990c23824559fb3a7f643bcba12a36e18330db37f9dc08d6
font_02_sfnt_off000127e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E5 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176