Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a31cefeb9001e97…

MALICIOUS

PDF

110.4 KB Created: 2021-01-10 10:57:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e9fe19fc5ee1ab87d299bbbb087af182 SHA-1: e2b36f2264a1b3dd9a15d10cdf042577ea9c68e5 SHA-256: 6a31cefeb9001e97f919126b1d9fa747505147dc6aaa403905cd4288083c1159
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a PDF link farm, suggesting a phishing or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the presence of numerous external URLs points to an attempt to redirect users to potentially harmful content.

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://traffnew.ru/wb?keyword=hearts%20of%20iron%204%20gameplay%202019 PDF link annotation
    • https://cdn.sqhk.co/kinibemazoz/Cjdqjh9/bluffton_sc_real_estate_rentals.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382197/normal_5f96594a95101.pdfIn PDF document text
    • https://bitujidup.weebly.com/uploads/1/3/4/5/134598072/1990139.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370791/normal_5f8910b8bef3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369631/normal_5fd3bcf874267.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443802/normal_5fe5e1e76475e.pdfIn PDF document text
    • https://wuxinaruniluxod.weebly.com/uploads/1/3/4/8/134882591/vodalapameditoso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372076/normal_5f8c64a37713d.pdfIn PDF document text
    • https://cdn.sqhk.co/vizebika/Ghejdsd/twitter_video_downloader_shortcut_ios_14.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/kovilowab/22509182407.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/search_everything_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/mesuvedom.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/joker_whatsapp_status_in_tamil_mp4.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_off00017221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17221 5856 bytes
SHA-256: 9812bd9ccefdaed1f07629651c183ead7d69eb6a41b925d8ddc24db4b147d6b6
font_01_sfnt_off0001860b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1860B 11416 bytes
SHA-256: 07e2c068dd1d582bd0e205823444d6681ef0f8fda47bd4b74ab7d9ec3db6589a

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