Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f88177fc8664793…

MALICIOUS

PDF

73.9 KB Created: 2021-02-07 13:39:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a99e66b9a20daa6aaa9d42e48ae26a51 SHA-1: 28d6617b484f3fb3a045a9b1c001123d3bf9d19a SHA-256: 4f88177fc8664793568b68f8ff1163597f18dc03a746def209f61906f8e238a0
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a redirector link farm and a phishing trojan. The document contains a large number of embedded URLs, many of which point to disposable hosting or known malicious redirectors, suggesting an attempt to lead users to malicious sites. While no scripts were explicitly extracted, the nature of the PDF and the embedded links strongly suggest it's designed to facilitate malicious redirects, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yafferge.ru/123?utm_term=de+pere+school+district+return+to+school In PDF document text
    • https://zizovelet.weebly.com/uploads/1/3/1/3/131380569/2bbb56.pdfIn PDF document text
    • http://flipping-car.online/health_and_nutrition_coach8456j.pdfIn PDF document text
    • http://womenit.space/lolos1dhbe.pdfIn PDF document text
    • http://kaxidabifibag.iblogger.org/amsterdam_centraal_station_platform_map.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486365/normal_5fc90c3c63d2e.pdfIn PDF document text
    • https://lufiwusogak.weebly.com/uploads/1/3/4/3/134319395/7da3004d908b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486367/normal_5fc7c4a442db8.pdfIn PDF document text
    • https://gugagefa.weebly.com/uploads/1/3/4/3/134343265/gifiw.pdfIn PDF document text
    • http://shimano-stradic.ru/735234370382hiht.pdfIn PDF document text
    • https://xakebugus.weebly.com/uploads/1/3/4/0/134018628/6409978.pdfIn PDF document text
    • https://ruwatija.weebly.com/uploads/1/3/4/8/134846771/refixofadigixomina.pdfIn PDF document text
    • https://putumilaw.weebly.com/uploads/1/3/1/3/131380263/892391ffe585.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/puffin_browser_free_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/list_of_spanish_adjectives.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/58925903134.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A2 4948 bytes
SHA-256: e0fcac79fd602433df6e1ba643fec8477c74cb26ea78d5837e214ac68cd16d00
font_01_sfnt_off0000f575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF575 10752 bytes
SHA-256: a7b90fc843514d999a6f3e4d608dce3dbc7c2ba3c30a88bb439a725ac86b153e

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