Malicious PDF — malware analysis report

Static analysis result for SHA-256 308174f100d6cd5b…

MALICIOUS

PDF

79.2 KB Created: 2021-04-01 14:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c5dca3a0e1b407c6a291f7b60de6fdac SHA-1: 3e60da9e11fc94ed001d0be6c49af49e0c567e03 SHA-256: 308174f100d6cd5b0e9f56713d4945218e4cfb6e0158afc53e59a1734083e990
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on external domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs suggest a link farm or redirection scheme to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://golowaki.ru/123?utm_term=mean+and+variance+of+standard+uniform+distribution PDF link annotation
    • https://cdn.sqhk.co/vitimosugu/0gdjdib/62733464083.pdfIn PDF document text
    • https://cdn.sqhk.co/buxifuludo/eieierK/zitiwefabaze.pdfIn PDF document text
    • https://cdn.sqhk.co/jasojime/hdheHao/kiki_passo_fans_only.pdfIn PDF document text
    • https://cdn.sqhk.co/runetonorox/ibjehfl/coloring_book_free_online_games.pdfIn PDF document text
    • https://verijijul.weebly.com/uploads/1/3/4/8/134861220/34ce4e6ca4fb8e3.pdfIn PDF document text
    • https://cdn.sqhk.co/tisewesir/Uxhbuib/cool_button_down_shirts_for_guys.pdfIn PDF document text
    • https://cdn.sqhk.co/dajusonas/cgjdhiD/instagram_app_download_for_iphone.pdfIn PDF document text
    • https://dunipilulu.weebly.com/uploads/1/3/4/8/134880259/8992274.pdfIn PDF document text
    • https://cdn.sqhk.co/sugumujozik/e5ciijh/1051650347.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/d10c9ade-eaa4-4bd9-a7a3-e70143225fde/spiritual_meaning_of_608.pdfIn PDF document text
    • https://s3.amazonaws.com/tomaxade/moxamovopulenifamegurej.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/how_to_file_an_aflac_short_term_disability_claim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e181add9-781c-4a4d-bb62-5b6bc11de9a5/integral_of_sinx2_cosx4_dx.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/gukaduwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f71133e-4cb7-47d4-8d84-aba80beab56f/72193387429.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4106611e-1fcf-41e2-bae1-559f0b327601/how_to_connect_bluetooth_polaroid_speaker.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/lijaxevisodajevadu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad03c023-ff0e-48a4-8df3-6b803abdbabc/41414528281.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/874e39f3-ff8f-43dc-a85c-f6c84fbbca86/23694456026.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fee430a-37c1-4c43-a312-d4e3af333057/doregetewemuratazopukeset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb981688-e736-4476-a83f-a44ac65db3c5/western_digital_my_cloud_ex2_backup_software.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/dijamofanusava.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA1 5340 bytes
SHA-256: ba7687794276dd4fe4275a690cbd5431aaeb91a4a093758ce0656b2e26bd7f73
font_01_sfnt_off0000f1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CC 11564 bytes
SHA-256: 0f93b4bf57edad882fb569c6c16a9e177dc1725fde3d9be3c2ddba86170a2648
font_02_sfnt_off000119a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A0 16148 bytes
SHA-256: 1a2b76eb92621148de57a48589384f2ed1ce1add53d2a8f9a0414c0ea737f4f8

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