Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca0c42c09aa5d99…

MALICIOUS

PDF

71.9 KB Created: 2021-01-08 08:03:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ea8b7ae4d3c79fc5e95cff79b1dfaea9 SHA-1: 995c91c3b21381996e0862f3a79e9cbc3e7df61f SHA-256: aca0c42c09aa5d999a8626ab887ff9427f1efcc5f0e9432fcdba6682dfc8a1c3
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains, indicating a link farm designed to redirect users. One critical heuristic identified a link to known malicious redirector infrastructure. The ClamAV detection and ML classifier also strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ggtraff.ru/aws?utm_term=ffxiv+bard+perform+music+sheets In PDF document text
    • https://toxisejaris.weebly.com/uploads/1/3/4/8/134851702/kekatomo-vopasak-begifezi.pdfIn PDF document text
    • https://perixezekawuxod.weebly.com/uploads/1/3/4/5/134504143/fifulitoxinex.pdfIn PDF document text
    • https://sagagedonu.weebly.com/uploads/1/3/4/0/134017332/jurexagudatut.pdfIn PDF document text
    • https://narebojabow.weebly.com/uploads/1/3/4/2/134266185/fetiwifapewig_tobokiwivajife.pdfIn PDF document text
    • https://jujowaganul.weebly.com/uploads/1/3/0/8/130874338/4579645.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450517/normal_5fee750b565ab.pdfIn PDF document text
    • https://pakipetunora.weebly.com/uploads/1/3/4/8/134881281/39f191.pdfIn PDF document text
    • https://kawuzuke.weebly.com/uploads/1/3/1/6/131606938/lefizuler-sofazufixi.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/453c2969-4f2c-433d-b8f5-0bea9d42559d/9375747665.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59f91afb-739c-4150-8876-ffa19988efb5/the_r_book_crawley_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e314bd60-5488-45da-be47-4cd2ff59f87f/80699771625.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/604ef534-81ae-4400-b28b-c012a4530ebd/smart_family_companion_vpn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aebb0cfb-ee4e-42c1-9ac3-f977e08f4fec/5th_grade_writing_rubric.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd3a644f-0411-4d91-9a20-456f2a2fa32f/2976620872.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_off0000db26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB26 5588 bytes
SHA-256: 4a00b89be700ef478357de7ac60361c5c3dcfeac049b2c6f262d006c1ae87972
font_01_sfnt_off0000ee04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE04 10768 bytes
SHA-256: becadcb2e520cff0dfc2e6edfa114730aaaa06e50fb2da1ff0d10f123c11c24a

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