Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8813d22ed512698…

MALICIOUS

PDF

76.9 KB Created: 2021-06-12 06:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2d16621f62b4ca5d775e2ee6ac805f9b SHA-1: 69b9be80bcab9041080e469c86d00520ad76397e SHA-256: a8813d22ed512698b8bf3088158121ce11e31fbc4e5f2101985add94fec5c7bf
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one pointing to a suspicious domain (smidgel.ru) that is likely used for phishing or malware distribution. ClamAV and ML classifiers also flagged this PDF as malicious. The presence of embedded URLs and the 'PDF_SEO_LINK_FARM' heuristic indicate a deliberate attempt to direct users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://smidgel.ru/pbw?utm_term=mcu+movie+sequence PDF link annotation
    • https://gulapizebulo.weebly.com/uploads/1/3/1/0/131070336/754475.pdfIn PDF document text
    • https://tatisosef.weebly.com/uploads/1/3/5/3/135333589/0ca338191.pdfIn PDF document text
    • https://vipeketiduwe.weebly.com/uploads/1/3/1/6/131636725/d112e0.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/76245ab1-a50e-49b1-9987-1e53bb2c9c2c/xuduwuvaseboxupup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43d07d80-396f-4126-ab7a-5292992ea83a/fotalafifejozug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31f4e297-0fec-4453-a1f0-4c09e0b3e8f6/jofonatorad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6be0cc4f-1f39-4c70-9d24-88cdef51af54/avaya_one_x_agent_2.5_13_download_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7e907d3-b67f-48a8-a76d-ec4caf041a38/how_to_identify_smith_corona_typewriter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/deb7b2ec-2a9d-4dc3-bfaf-d3131da5b82c/64035574684.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaea0f42-7a3f-4f45-8e5d-d4a2a238165e/11098648401.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d9d43b9-80c8-48ec-ad21-1bd2feef5d85/keto_guido_cookbook_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da6e798f-8d6d-474a-bb81-20e3ecb827f2/cuanto_pesa_un_metro_cubico_de_agua_en_kg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6336b5c8-a581-4681-ba6f-c5f80a10f2a6/how_to_divide_decimal_numbers_by_1000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3be9eeac-50fa-4b02-a5ae-afe768e2f75b/aswc_install_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27c0430f-7d39-49e9-8ee6-3f7b41abd109/when_do_you_plant_dahlia_bulbs_in_ontario.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/763a5532-7b08-4530-811f-194e8389f483/tribe_of_mentors_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbcb45a0-be28-47ea-b1a9-40910d15f851/boy_scout_pocket_knife_safety.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e85beac-e8c9-4a6e-b850-cb09b04edce2/rimobuliwer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8aa1562-0c39-490c-b0f1-96256b467eb1/ladog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e37c0829-3451-4b24-a77e-bdeea1f1806c/wojogevuzi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF040 4796 bytes
SHA-256: 262ea12f410b473c525288074dd7792e4f4f45a82eb65387adb5f71e2e7588d6
font_01_sfnt_off000100a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A0 10740 bytes
SHA-256: c24405331b5cd35e55e4d01651e257440903a038c404a3f063445e8834a5d483

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