Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3563ccbb3fbb824…

MALICIOUS

PDF

89.6 KB Created: 2021-02-01 09:11:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2e9508446f921c6833c58c65df321d3f SHA-1: 72fbb866c4d371f4ec48ab75e906013cc7f68d77 SHA-256: b3563ccbb3fbb82458a0ac0840a6480bae3920627917beacb6f453a1f75bcfcf
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://jacksth.ru/aws?utm_term=atlas+world+map+book+pdf PDF link annotation
    • https://zaluvunikuf.weebly.com/uploads/1/3/1/0/131070459/repenaxujifu_gisenudu.pdfIn PDF document text
    • https://cdn.sqhk.co/zarifabidit/8iighDA/boy_bmx_bike_20_inch_wheels.pdfIn PDF document text
    • https://cdn.sqhk.co/jepivitixiwo/jdibxjc/95107814531.pdfIn PDF document text
    • https://bimovuwun.weebly.com/uploads/1/3/4/7/134727863/3190998.pdfIn PDF document text
    • https://cdn.sqhk.co/dalegoti/gx3gjja/slot_cars_sold_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/wibononuve/ijB8igV/27456232872.pdfIn PDF document text
    • http://dalnoboyi.xyz/manual_de_terapeutica_medica_salvador_zubiran7ykbz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417808/normal_5fd95cb65f8d9.pdfIn PDF document text
    • https://cdn.sqhk.co/tubadaluzafu/jhVjeWi/39403398813.pdfIn PDF document text
    • https://dilozerekake.weebly.com/uploads/1/3/1/4/131452754/6684990.pdfIn PDF document text
    • https://bogogumufen.weebly.com/uploads/1/3/4/0/134018830/1687715.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bivuraxut.rf.gd/collage_maker_photo_app.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_off000121ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AC 5472 bytes
SHA-256: cb2f952467e4bb45b27ecd23a29e0166397c9a7932765b7f432fb242ff9847ea
font_01_sfnt_off0001343a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1343A 11244 bytes
SHA-256: 96ec7324f0f30759c04678ec78ef028aff61bcc08376591dea2e5f47503dafd7

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