Malicious PDF — malware analysis report

Static analysis result for SHA-256 55626b7a1aac6f6a…

MALICIOUS

PDF

77.6 KB Created: 2021-01-12 15:08:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0fd4b72de5c67c7537779f3b8e522c0a SHA-1: 54002b2f86f418fb0eec26af89daac5023642f30 SHA-256: 55626b7a1aac6f6a9b89a951745117bd6b7350ddec7734ac91179502e671b2d2
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document contains a large number of embedded links, many of which point to disposable hosting services and redirector infrastructure. The heuristic firings indicate that this is a link farm designed to direct users to malicious sites, potentially for phishing or malware distribution. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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://gettraff.ru/aws?utm_term=cincinnati+bengals+injury+report+week+14 In PDF document text
    • https://fevijalefo.weebly.com/uploads/1/3/4/3/134383315/gabegepupenasup.pdfIn PDF document text
    • https://zovuwiveja.weebly.com/uploads/1/3/4/8/134880504/dojababawevak.pdfIn PDF document text
    • https://nasipowo.weebly.com/uploads/1/3/1/3/131383467/92754b346cb6ee4.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/mumezumis-jibukolumu-jogor.pdfIn PDF document text
    • https://wozofawado.weebly.com/uploads/1/3/0/8/130874325/49ce6e07b.pdfIn PDF document text
    • https://cdn.sqhk.co/jokutevek/jgicBjj/lamadopilot.pdfIn PDF document text
    • https://gideturifit.weebly.com/uploads/1/3/4/8/134887905/visowafalexo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477147/normal_5fbc5a35ab458.pdfIn PDF document text
    • https://jebasiju.weebly.com/uploads/1/3/1/3/131381450/7449273.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E3 5620 bytes
SHA-256: e473f53a6853d06e6546e88bbf141c52aa5a92498846207823d302fc811a2664
font_01_sfnt_off0000f531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF531 12380 bytes
SHA-256: eca4f4814473ea3725a1e15ff82da8dee2bef9d4fac8e5ef60b234c52970bd42
font_02_sfnt_off00011bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFA 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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