Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23d4c4b7472eb10…

MALICIOUS

PDF

75.1 KB Created: 2021-05-22 07:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b0e900cde8b951a461678da547108b51 SHA-1: ed969229887f1a67b2eba7add570e848bb44d724 SHA-256: a23d4c4b7472eb1020167e24175fb4e79d197effa64a17c7667a944e265d93b3
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://yafferge.ru/strik?utm_term=how+to+write+chinese+stroke In PDF document text
    • https://tixiganotirof.weebly.com/uploads/1/3/1/1/131163533/ziduso.pdfIn PDF document text
    • https://gewipilozu.weebly.com/uploads/1/3/0/7/130775211/fodipixixeviro-lorujefozek.pdfIn PDF document text
    • https://fakozopaximubod.weebly.com/uploads/1/3/1/4/131453484/vudedaluzus_zupud_paletatipove.pdfIn PDF document text
    • https://sujujiga.weebly.com/uploads/1/3/1/3/131379538/tiwixokixixanogepu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369909/normal_6003f56d023dd.pdfIn PDF document text
    • https://nakalefa.weebly.com/uploads/1/3/4/5/134522788/5769235.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503390/normal_6031b5b95c6a1.pdfIn PDF document text
    • https://zokukomusisitu.weebly.com/uploads/1/3/5/3/135323242/jipepamarobuxej-vezodafapuziba.pdfIn PDF document text
    • https://kobuwejen.weebly.com/uploads/1/3/0/8/130873730/taxule_gakilujuvow_kenuvoxob.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/c40cd05d-9878-4e3b-a0cf-ef9cf917b525/toto_toilet_replacement_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/41447375364.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/bricklaying_and_plastering_tools.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/farewell_to_arms_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7878092d-4084-42d1-855e-a6b3c96773fe/23036108978.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/girlfriends_guide_to_divorce_jo_pregnant.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/tissot_touch_connect_solar.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/kekebo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09c4d80f-3aa7-4626-9506-0ff27a14f14e/mazududopabiligub.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/template_label_tom_and_jerry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/624d4122-6f34-4adf-8f8c-dace17fee9c1/66275250613.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/sukezonasewomokuvamoxis.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_off0000ea06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA06 4764 bytes
SHA-256: 9d4636eb8c27a7d6df1e8fc95f2914273f39de2f6a9896d36020f5d9ff006501
font_01_sfnt_off0000fa46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA46 10904 bytes
SHA-256: 8c00d54f274b6947afe135f8b6f98e9d9b39b4942551ce9e78c7960a36878643

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