Malicious PDF — malware analysis report

Static analysis result for SHA-256 2628a03adae42a70…

MALICIOUS

PDF

73.4 KB Created: 2021-02-14 19:42:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ec87fd8a0eb2dc3411f6718058d92047 SHA-1: d960b54f172b5cc9dc20e976af55e79cf8d48615 SHA-256: 2628a03adae42a70b901902b2637f814b9a610c6e68192fb3c60190ada454b86
156 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one primary URL pointing to a suspicious domain that appears to be a lure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of generated links, suggesting an attempt to manipulate search results or distribute content broadly. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

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://jottigo.ru/wix?keyword=alpha+epsilon+lambda+wiki PDF link annotation
    • https://cdn.sqhk.co/goberirud/ejg7FMy/zapabawude.pdfIn PDF document text
    • https://cdn.sqhk.co/lewiwifo/4jjhgha/jibjab_hack_download_free_videos.pdfIn PDF document text
    • http://you-bestshop.xyz/1990695538mibj5.pdfIn PDF document text
    • https://cdn.sqhk.co/fifenije/jgfgcNP/auction_application_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/mexovaru/jggiigd/monstercrafter_hack_ios.pdfIn PDF document text
    • https://mulokigapasol.weebly.com/uploads/1/3/1/0/131070847/3230735.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kavalukato/55532940138.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/22550368729.pdfIn PDF document text
    • https://s3.amazonaws.com/dikomavomem/beauty_plus_camera_free_for_laptop.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/daedalus_and_icarus_task_12_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/bebepibofokew.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/japan_guided_tours_from_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/85407787679.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/dcfs_online_report_los_angeles.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/air_conditioning_system_nptel.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/endocrinology_diabetes_and_metabolism_case_reports_journal.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/latest_android_update_for_samsung_s9.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_off0000e37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37F 5388 bytes
SHA-256: 710a42cfd59b50602b26b74c7e5449e2bef9727ca2ebc69eb7b397c9c4289ddc
font_01_sfnt_off0000f5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B0 10196 bytes
SHA-256: f2a3eb77f2e3436f1499b68ac39dc29facd16667459a2296df7074eda67ecdd4

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