Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd99590363f564a…

MALICIOUS

PDF

90.7 KB Created: 2021-02-17 10:10:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 73ff50809a63c32dffb42af3ec82d350 SHA-1: a6509099c4d6bafc345b296d2be6c992d06f9127 SHA-256: 7fd99590363f564af384c1eb9f67c02229611bcd7f2558407fcdfcb3ceb9b043
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external domains, many of which are part of a link farm, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/wix?keyword=silicone+allergy+breast+implants PDF link annotation
    • https://cdn.sqhk.co/pikukafil/iaDjegj/tro_choi_poly_art_3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460950/normal_600b995e46311.pdfIn PDF document text
    • https://cdn.sqhk.co/dogutadova/WgTO4hc/sawobe.pdfIn PDF document text
    • http://genusttwsr.fun/40717941942jkob4.pdfIn PDF document text
    • http://aycotoro6.xyz/33635480091q2xjz.pdfIn PDF document text
    • http://gatorama.site/fotapesit5l9bs.pdfIn PDF document text
    • https://cdn.sqhk.co/rinugezig/8Luihgc/huawei_p_smart_assistive_touch.pdfIn PDF document text
    • https://cdn.sqhk.co/kujotukil/gihgfje/71702541332.pdfIn PDF document text
    • https://cdn.sqhk.co/datolabevev/9timumX/48088690053.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://janosunitemixe.epizy.com/97747968369.pdfIn PDF document text
    • http://wikimenuvebiz.epizy.com/beauty_camera_apk_2017.pdfIn PDF document text
    • http://waduxixefe.rf.gd/birthday_card_template_for_teacher.pdfIn PDF document text
    • http://luwusifijusu.rf.gd/nedosufonewijufujemi.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_off00012660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12660 5600 bytes
SHA-256: ec87ad14037adf7f403c65b1a7b61387bcf1ea3547771fd167d7ace151aa0b60
font_01_sfnt_off00013961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13961 10928 bytes
SHA-256: add0f55c9d0d975e50fde0002568830b4f7f22b1b7e15132afeb1fb9c4c93852

Open this report in the interactive analyzer, or submit your own file for analysis.