Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef230b68a3d7dfca…

MALICIOUS

PDF

74.9 KB Created: 2020-12-15 19:43:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 9529453e48e2ead68f112bcabc9844ce SHA-1: b4fea3554857a2ab70570cffca68fb8cd2fb06a8 SHA-256: ef230b68a3d7dfca50e16eacf28c5c70f9f0158f31d88d2cf6b49b7edfb102c1
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a link farm, directing users to a suspicious URL that is disguised as an Android application download. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffnew.ru/aws?utm_term=afirewall+call+and+sms+blocker+apk PDF link annotation
    • https://mezuxanivatanid.weebly.com/uploads/1/3/4/4/134499991/rujolenogiliril.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372087/normal_5f9458a6b1ea3.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://uploads.strikinglycdn.com/files/93bfac05-13e0-479f-8bb2-8035c65d9c3d/xuparexogemajirogew.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc117cc3398ff75152f2ade/t/5fcfc02859fb18758d2d1540/1607450664307/coalition_multiplayer_fps_pc_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbffcc36609fd0ee78c2f31/t/5fc0e6ef145a8629dcd213c0/1606477555701/53631361642.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd0406b474932ca2689901/1606222855210/wash_by_william_faulkner_characters.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc512818ef7301f8b2bd9f2/t/5fccdd17c836a917f90c0ab5/1607261464505/webtoon_promo_codes_april_2020.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc79caa48c1673e559ddea1/t/5fd6a9e9e5ac5828962d5eea/1607903722863/88556123654.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/gummy_drop_hacks_pc.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc526639955c744b556fee0/t/5fca062b196a600d3c374c58/1607075372095/learn_c_online_with_certification_free.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC275 5292 bytes
SHA-256: 8ae2d69160e17094a8e9b19e72aeecd69476a32bf4e5db6bbd091063a883c652
font_01_sfnt_off0000d455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD455 11860 bytes
SHA-256: 10c630455acc6a47e2a707c63f742cfa2b616232ea7bd2478d1dd73c4a2f64ab
font_02_sfnt_off0000fb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB65 16132 bytes
SHA-256: 29a60492f44b39d68fa00197234d6df9a0cf581d74754725da64c153577ac146
font_03_sfnt_off00011057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11057 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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