Malicious PDF — malware analysis report

Static analysis result for SHA-256 998fd836901af965…

MALICIOUS

PDF

64.0 KB Created: 2020-12-02 15:20:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 340941a62a61da45f69a6177058d5f60 SHA-1: 1921d5f6825ee7b0ccd9e061bd56f7d3be2bde41 SHA-256: 998fd836901af965baeebed4c9a31404b77bf30a56808e82fb81630b8c94cedd
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO spamming tactic to drive traffic to malicious sites. The document body, though heavily obfuscated, appears to be related to search terms for manga, likely a lure to disguise the malicious intent of redirecting users to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffine.ru/123?utm_term=saint+seiya+next+dimension+manga+espa%25C3%25B1ol
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/833092.pdf
    • https://zupawifotifawe.weebly.com/uploads/1/3/4/4/134480263/jenozofamonugu_sisopo_kuwawam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe2b3ca97599144ec195e7/1606298435928/ragapazibaremoxukolo.pdf
    • https://s3.amazonaws.com/paropabaru/tasinuruvifuvupin.pdf
    • https://s3.amazonaws.com/nigimul/pharmacological_classification_of_drugs_download.pdf
    • https://s3.amazonaws.com/sebunuzu/ray_achievement_motivation_scale.pdf
    • https://uploads.strikinglycdn.com/files/68a1785d-c51c-480f-985e-36249b6e3da5/xajeje.pdf
    • https://static1.squarespace.com/static/5fc4e5cef7cf8c75404468c7/t/5fc5081af8cdb769c681c690/1606748191768/what_is_an_american_essay_summary.pdf
    • https://s3.amazonaws.com/fatisake/mejuporaguwapi.pdf
    • https://static1.squarespace.com/static/5fc36ee160f2895dc1f7ed49/t/5fc558bb3c6ccf69f310d2e9/1606768827596/faraborebunu.pdf
    • https://static1.squarespace.com/static/5fc0cf44e5c7695ca99b2c1d/t/5fc2cbc64e98326c026d32e4/1606601670792/49054115909.pdf
    • https://static1.squarespace.com/static/5fbfceb2c14dfd36feeb11ef/t/5fc3718bfa04221c718c2557/1606644108057/lukurimoga.pdf
    • https://uploads.strikinglycdn.com/files/8b672ce6-cbb2-4212-a70a-b03b8302e087/37547583140.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000acb1.bin
3eebb2ec24389b4e08beef06ca019e72f61cdc10f49883df21863efe5c043f3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACB1 5456 bytes
font_01_sfnt_off0000beee.bin
eb3ce587b72b9fc9e173eae513fa6d6173b6d4657d7d7f1d9f67be264e803e9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEEE 11148 bytes
font_02_sfnt_off0000e2d9.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D9 4324 bytes

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