Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6539b25637e9e8b…

MALICIOUS

PDF

71.4 KB Created: 2021-01-23 01:50:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d5c4717791969f0252e2b11dfcee4e7e SHA-1: 0d7393c18b70277000c3f22f227901ac698f1a8d SHA-256: d6539b25637e9e8b02fe9adeaabf53efb9e4a867fafed07630810528d5c2f1c2
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file contains a large number of embedded links, many of which point to disposable hosting or known redirector infrastructure. The primary purpose appears to be directing users to malicious sites, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The ML classifier and ClamAV also strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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://traffmen.ru/123?utm_term=how+to+use+decrypted+cache+key In PDF document text
    • https://kawavaturitavo.weebly.com/uploads/1/3/5/3/135321378/a8369be8e424af7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420014/normal_5fc5ac08277f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495994/normal_5fd7f46bc4844.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455657/normal_5fd987b3df3ef.pdfIn PDF document text
    • https://vexefanakaxaki.weebly.com/uploads/1/3/4/8/134871487/nofizixu_petogutil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448103/normal_5feb6b1a37e2f.pdfIn PDF document text
    • https://site-1182116.mozfiles.com/files/1182116/amendment_to_offer_letter_template.pdfIn PDF document text
    • https://site-1174481.mozfiles.com/files/1174481/1578267388.pdfIn PDF document text
    • https://bobilemako.weebly.com/uploads/1/3/4/7/134733435/besugo-vudejepe-zozod.pdfIn PDF document text
    • https://site-1168056.mozfiles.com/files/1168056/44843696155.pdfIn PDF document text
    • https://dejutuzalusabi.weebly.com/uploads/1/3/4/8/134869317/digep.pdfIn PDF document text
    • https://gabofulonu.weebly.com/uploads/1/3/4/7/134730366/9883950.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463809/normal_600b54503c187.pdfIn PDF document text
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/dedurakoteju.pdfIn PDF document text
    • https://mojabizozawobe.weebly.com/uploads/1/3/4/6/134699592/d9bf9590c701.pdfIn PDF document text
    • https://lulotabo.weebly.com/uploads/1/3/4/7/134745182/budujumeberexidi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410418/normal_5fcaa77d18831.pdfIn PDF document text
    • https://site-1175951.mozfiles.com/files/1175951/telaja.pdfIn PDF document text
    • https://tavadubamik.weebly.com/uploads/1/3/4/4/134473349/7914452.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000db76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB76 5348 bytes
SHA-256: e641cf72a94d82113a8290e883dd61636efe05983ab497c5e5714068bec19886
font_01_sfnt_off0000edb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB3 10040 bytes
SHA-256: a6f31676b9277c26f1ddb35bbf64f76c7c5353ab2f21bc0e672e8fbcaaf4dac5

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