Malicious PDF — malware analysis report

Static analysis result for SHA-256 15e116cf1383b396…

MALICIOUS

PDF

80.3 KB Created: 2021-02-26 23:56:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d81afed650181a5a4cdedf19d1aa9d61 SHA-1: dc0dea1a3298c8a2820ef302de9bfba9ce2491ce SHA-256: 15e116cf1383b396cc666e088e5fe1c91dcddd0df581f3b21479e5c6421511d8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically a phishing or trojan distribution. While no scripts were directly extracted, the PDF structure and external links are indicative of malicious activity, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/aws?utm_term=marlin+336+dark+specs PDF link annotation
    • http://rufujatev.iblogger.org/vupul.pdfIn PDF document text
    • http://organicsss.space/premium_plc_schneidereuh0e.pdfIn PDF document text
    • http://bunnygummy.ru/75895334126opg1h.pdfIn PDF document text
    • https://ramakizuwag.weebly.com/uploads/1/3/4/3/134321509/f96e8f111120c5.pdfIn PDF document text
    • http://rivimebowov.22web.org/96704756874.pdfIn PDF document text
    • http://kofagurosufo.22web.org/dexerazojulejurodim.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/tozaduliwubega/40757808163.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/jitterbug_smartphone_battery_problems.pdfIn PDF document text
    • http://zitasixan.atwebpages.com/twilight_breaking_dawn_part_2_soundtrack_cd.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/rowdy_baby_video_song_tamil_hd.pdfIn PDF document text
    • http://jubalagifagusop.epizy.com/critical_ops_hack_wallhack.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/california_halibut_fishing_report.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/how_to_smoke_on_a_brinkmann_smoke_n_grill.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/loss_of_accountable_forms_without_money_value.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/dulofowuzukufogasuguroto.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_off0000e884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE884 5456 bytes
SHA-256: 2446a6797501f51db4400db4ed857d622fd1a2dcbd3dcc8e00b162945d50f123
font_01_sfnt_off0000fb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB22 10560 bytes
SHA-256: 8fd48d976563330580a6ea1f929bf54936ad853f8109da0b0c8afd1434180489
font_02_sfnt_off00011f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F91 16060 bytes
SHA-256: 5b45d8957cdd618c0f157c507058aef1810e6158bb3d1abf257796d6008f54d1

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