Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1a97e3aa592e76c…

MALICIOUS

PDF

71.4 KB Created: 2020-12-16 23:19:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8f33f178f9f9a517c4294f77e8bcde88 SHA-1: f1fb51cd45d9eac89646e83927dd81c8c50687f1 SHA-256: d1a97e3aa592e76c90afe0f4fac6d2cab17faef215fd3491f5c0cc5d19c7c304
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also listed as an embedded URL. The ML classifier and ClamAV also flagged this file as malicious, indicating a phishing or trojan attempt. The embedded link likely leads to a malicious site designed to exploit the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?utm_term=letter+of+recommendation+for+a+coach+sample In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370746/normal_5fd6376f92693.pdfIn PDF document text
    • https://wamibujobaju.weebly.com/uploads/1/3/4/7/134716207/3589734.pdfIn PDF document text
    • https://dokoxinizim.weebly.com/uploads/1/3/4/3/134305801/586b68f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366369/normal_5f88ede3a234e.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/mikukinib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ede9ac62-c89d-407f-bc95-3ef435e4fad5/377309743.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0ec6c8787e879896c16ae/t/5fcc25203ff1011540e15c17/1607214369447/fun_words_that_start_with_the_letter_p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2d311cd-284c-4718-83c3-87e19ad2af12/31561301572.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc66b1c3398ff7515537f6c/t/5fd0610c12264b5dfdcaed1e/1607491853553/fruit_smasher_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/3578771227.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6d88a504bb4653ce18603/t/5fca77ace462045bd0f45aaa/1607104429155/suvuboganojefabedesiwa.pdfIn PDF document text
    • https://s3.amazonaws.com/ruletetunima/gelonotigu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc55249c6d96458363f68a7/t/5fd63285ab1a676c7287c882/1607873158893/ayurvedic_medicine_books_in_telugu.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_off0000dc7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7C 5336 bytes
SHA-256: 25838cfa7a08b77e36ea85fd3d0c7ea21f95b3dbc83d5f31a55975e36c514043
font_01_sfnt_off0000ee7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7C 10028 bytes
SHA-256: bc769cf2653d5d8199330c0a2b84a739589fb1b91bbb4b0405c9f6299cf11334

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